Downgrade suid w/o PIE from error to warning

Some languages (such as Hare) do not support position-independent
executables. Such cases require extra care and scrutiny, but should not
be entirely disallowed.

abuild.in

@@ -833,9 +833,9 @@ postcheck() {
 		| xargs scanelf --nobanner --etype ET_EXEC \
 		| sed "s|ET_EXEC $dir|\t|")
 	if [ -n "$i" ]; then
-		error "Found non-PIE files that has SUID:"
+		warning "Found non-PIE files that have SUID:"
 		echo "$i"
-		e=1
+		warning "suid executables SHOULD be compiled with PIE if possible"
 	fi
 	# test suid bit on executable
 	if ! options_has "suid"; then