Remove objdump and open/read/write/fstat symbol names check.  objdump
is not available on all architectures and the symbol names are
unlikely to ever change from their visible names on FreeBSD.

--- configure.orig	2019-07-25 21:31:45 UTC
+++ configure
@@ -628,7 +628,6 @@ ALLOCA
 EGREP
 GREP
 CPP
-OBJDUMP
 AWK
 TAR
 MT
@@ -4283,51 +4282,6 @@ $as_echo "no" >&6; }
 fi
 
 
-for ac_prog in objdump gobjdump
-do
-  # Extract the first word of "$ac_prog", so it can be a program name with args.
-set dummy $ac_prog; ac_word=$2
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
-$as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_path_OBJDUMP+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  case $OBJDUMP in
-  [\\/]* | ?:[\\/]*)
-  ac_cv_path_OBJDUMP="$OBJDUMP" # Let the user override the test with a path.
-  ;;
-  *)
-  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-    for ac_exec_ext in '' $ac_executable_extensions; do
-  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_path_OBJDUMP="$as_dir/$ac_word$ac_exec_ext"
-    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
-    break 2
-  fi
-done
-  done
-IFS=$as_save_IFS
-
-  ;;
-esac
-fi
-OBJDUMP=$ac_cv_path_OBJDUMP
-if test -n "$OBJDUMP"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJDUMP" >&5
-$as_echo "$OBJDUMP" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-fi
-
-
-  test -n "$OBJDUMP" && break
-done
-
 # Check whether --enable-largefile was given.
 if test "${enable_largefile+set}" = set; then :
   enableval=$enable_largefile;
@@ -4939,11 +4893,7 @@ fi
 
 
 
-if test -z "$OBJDUMP"; then
-	as_fn_error $? "unable to find objdump" "$LINENO" 5
-fi
 
-
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable assertions" >&5
 $as_echo_n "checking whether to enable assertions... " >&6; }
   # Check whether --enable-assert was given.
@@ -5948,86 +5898,12 @@ fi
 fi
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking linking open() and write() to detect libc names" >&5
-$as_echo_n "checking linking open() and write() to detect libc names... " >&6; }
-ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
-
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-
-		#define _LARGEFILE64_SOURCE
-		#include <unistd.h>
-		#include <fcntl.h>
-		#include <sys/stat.h>
-		int main(int argc, char **argv) {
-			unsigned x;
-			struct stat st;
-			open(*argv,O_RDONLY);
-			fstat(0,&st);
-			read(0,&x,sizeof(x));
-			write(1,"null",4);
-		}
-
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: OK" >&5
-$as_echo "OK" >&6; }
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking name of open() in C library" >&5
-$as_echo_n "checking name of open() in C library... " >&6; }
-	libc_open=`$OBJDUMP -T conftest | $AWK '/\*UND\*/ && $NF ~ /^open/ { print $NF }'`
-
 cat >>confdefs.h <<_ACEOF
-#define LIBC_OPEN $libc_open
+#define LIBC_OPEN open
+#define LIBC_READ read
+#define LIBC_WRITE write
+#define LIBC_FSTAT fstat
 _ACEOF
-
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_open" >&5
-$as_echo "$libc_open" >&6; }
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking name of read() in C library" >&5
-$as_echo_n "checking name of read() in C library... " >&6; }
-	libc_read=`$OBJDUMP -T conftest | $AWK '/\*UND\*/ && $NF ~ /^read/ { print $NF }'`
-
-cat >>confdefs.h <<_ACEOF
-#define LIBC_READ $libc_read
-_ACEOF
-
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_read" >&5
-$as_echo "$libc_read" >&6; }
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking name of write() in C library" >&5
-$as_echo_n "checking name of write() in C library... " >&6; }
-	libc_write=`$OBJDUMP -T conftest | $AWK '/\*UND\*/ && $NF ~ /^write/ { print $NF }'`
-
-cat >>confdefs.h <<_ACEOF
-#define LIBC_WRITE $libc_write
-_ACEOF
-
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_write" >&5
-$as_echo "$libc_write" >&6; }
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking name of fstat() in C library" >&5
-$as_echo_n "checking name of fstat() in C library... " >&6; }
-	libc_fstat=`$OBJDUMP -T conftest | $AWK '/\*UND\*/ && $NF ~ /^fstat/ { print $NF }'`
-
-cat >>confdefs.h <<_ACEOF
-#define LIBC_FSTAT $libc_fstat
-_ACEOF
-
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_fstat" >&5
-$as_echo "$libc_fstat" >&6; }
-
-else
-  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
-$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
-as_fn_error $? "failed to link open/write test
-See \`config.log' for more details" "$LINENO" 5; }
-
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext