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/cdboot_test.in

@@ -22,16 +22,16 @@ grubshell=@builddir@/grub-shell
 case "${grub_modinfo_target_cpu}-${grub_modinfo_platform}" in
     # PLATFORM: emu is different
     *-emu)
-	exit 0;;
+	exit 77;;
     # PLATFORM: Flash targets
     i386-qemu | i386-coreboot | mips-qemu_mips | mipsel-qemu_mips)
-	exit 0;;
+	exit 77;;
     # FIXME: currently grub-shell uses only -kernel for loongson
     mipsel-loongson)
-	exit 0;;
+	exit 77;;
     # FIXME: OFW fails to open CD-ROM
     i386-ieee1275)
-	exit 0;;
+	exit 77;;
 esac
 
 v=$(echo hello | "${grubshell}" --boot=cd)