Mk/Scripts/qa.sh: Turn off pipefail when piping to grep -q

The pipeline

   readelf -d "${dep_file}" | grep -q SONAME

can fail because grep -q closes the output early resulting sigpipe being
sent to readelf.  Other possible solutions are to turn off pipefail for
the file or remove the -q grep argument.

Credit to ashish@ for the detective work to discover the root cause of
this.

Differential Revision: https://reviews.freebsd.org/D31211

Reviewed by:	emaste
Approved by:	bapt (portmgr) mat (portmgr)

Mk/Scripts/qa.sh

@@ -663,9 +663,13 @@ proxydeps() {
 
 				# Check that the .so we need has a SONAME
 				if [ "${dep_file_pkg}" != "${PKGORIGIN}" ]; then
+					# When grep -q finds a match it will close the pipe immediately.
+					# This may cause the test to fail when pipefail is turned on.
+					set +o pipefail
 					if ! readelf -d "${dep_file}" | grep -q SONAME; then
 						err "${file} is linked to ${dep_file} which does not have a SONAME.  ${dep_file_pkg} needs to be fixed."
 					fi
+					set -o pipefail
 				fi
 
 				# If we don't already depend on it, and we don't provide it