POSIX patch(1) would treat -b as different meaning (the functionality

is to be provided by --suffix).  Looking at the usage here in diffutils,
it seems that we can just get rid of the -b .orig stuff.  This resolves
a problem that can triggered if we move toward to a more permissively
licensed patch(1) program.

gnu/usr.bin/diff/Makefile

@@ -29,7 +29,7 @@ LDADD=	-lgnuregex
 
 .for f in diff.c context.c
 ${f}: ${DIFFSRC}/${f} ${.CURDIR}/${f}.diff
-	patch -s -b .orig -o ${.TARGET} < ${.CURDIR}/${f}.diff ${DIFFSRC}/${f}
+	patch -s -o ${.TARGET} < ${.CURDIR}/${f}.diff ${DIFFSRC}/${f}
 CLEANFILES+= ${f}
 .endfor
 

gnu/usr.bin/diff3/Makefile

@@ -20,7 +20,7 @@ CFLAGS+=-DDEFAULT_DIFF_PROGRAM=\"/usr/bin/diff\"
 
 .for f in diff3.c
 ${f}: ${DIFFSRC}/${f} ${.CURDIR}/${f}.diff
-	patch -s -b .orig -o ${.TARGET} < ${.CURDIR}/${f}.diff ${DIFFSRC}/${f}
+	patch -s -o ${.TARGET} < ${.CURDIR}/${f}.diff ${DIFFSRC}/${f}
 CLEANFILES+= ${f}
 .endfor
 

gnu/usr.bin/sdiff/Makefile

@@ -21,7 +21,7 @@ CFLAGS+=-DDEFAULT_DIFF_PROGRAM=\"/usr/bin/diff\"
 
 .for f in sdiff.c
 ${f}: ${DIFFSRC}/${f} ${.CURDIR}/${f}.diff
-	patch -s -b .orig -o ${.TARGET} < ${.CURDIR}/${f}.diff ${DIFFSRC}/${f}
+	patch -s -o ${.TARGET} < ${.CURDIR}/${f}.diff ${DIFFSRC}/${f}
 CLEANFILES+= ${f}
 .endfor