tests: Exit with skipped exit code when test not performed

These tests were not performed and therefore did not pass, nor fail. This
fixes misleading test exit code where, for instance, the pseries_test will
pass on i386-pc, which is not a pseries architecture.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

tests/core_compress_test.in

@@ -22,7 +22,7 @@ grubshell=@builddir@/grub-shell
 case "${grub_modinfo_target_cpu}-${grub_modinfo_platform}" in
     # FIXME: Only mips currently supports configurable core compression
     *-emu | i386-* | x86_64-* | sparc64-* | ia64-*)
-	exit 0
+	exit 77
 	;;
 esac