lang/ratfor: fix build on platforms where char is unsigned

Turns out the code anticipates this problem and has support for using
"signed char" over "char" where "char" is unsigned by default.

Use "signed char" unconditionally to fix the port on all platforms.

While we are at it, pet portclippy.

PR:		258628, 283509
Approved by:	bofh
MFH:		2024Q4

lang/ratfor/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	ratfor
 PORTVERSION=	1985.06
-PORTREVISION=	16
+PORTREVISION=	17
 CATEGORIES=	lang
 MASTER_SITES=	LOCAL/obrien \
 		http://sepwww.stanford.edu/sep/prof/
@@ -12,20 +12,15 @@ COMMENT=	Rational FORTRAN compiler
 LICENSE=	PD
 LICENSE_FILE=	${WRKSRC}/README
 
-BROKEN_aarch64=		./ratfor -o test.f test.r keeps creating huge output file
-BROKEN_armv6=		./ratfor -o test.f test.r keeps creating huge output file
-BROKEN_armv7=		./ratfor -o test.f test.r keeps creating huge output file
-BROKEN_powerpc=		./ratfor -o test.f test.r keeps creating huge output file
-BROKEN_powerpc64=	./ratfor -o test.f test.r keeps creating huge output file
-BROKEN_powerpc64le=	./ratfor -o test.f test.r keeps creating huge output file
-BROKEN_powerpcspe=	./ratfor -o test.f test.r keeps creating huge output file
+USES=		fortran
+
+ALL_TARGET=	all tests
 
-NO_WRKSUBDIR=	yes
 EXTRACT_CMD=	${CAT}
 EXTRACT_BEFORE_ARGS=
 EXTRACT_AFTER_ARGS=	| ${SH}
-ALL_TARGET=	all tests
-USES=		fortran
+
+NO_WRKSUBDIR=	yes
 
 PLIST_FILES=	bin/ratfor bin/ratfor77 share/man/man1/ratfor.1.gz
 

lang/ratfor/files/patch-Makefile

@@ -5,7 +5,7 @@
  #
  
 -CFLAGS+=	-DF77 -DS_CHAR="char"
-+CFLAGS+=	-DF77 -DS_CHAR="char" -Wno-error=return-type
++CFLAGS+=	-DF77 -DS_CHAR="signed char" -Wno-error=return-type
  #CFLAGS+=	-DS_CHAR="char"
  OBJS=		rat4.o lookup.o getopt.o