test: run longjmp() test only on supported architectures

We have only implemented longjmp() on the EFI architectures.

Define a symbol CONFIG_HAVE_SETJMP and have it selected by the relevant
architectures.

Use CONFIG_HAVE_SETJMP to decide if the longjmp test shall be built.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

test/lib/Makefile

@@ -11,7 +11,7 @@ obj-$(CONFIG_EFI_SECURE_BOOT) += efi_image_region.o
 obj-y += hexdump.o
 obj-$(CONFIG_SANDBOX) += kconfig.o
 obj-y += lmb.o
-obj-y += longjmp.o
+obj-$(CONFIG_HAVE_SETJMP) += longjmp.o
 obj-$(CONFIG_CONSOLE_RECORD) += test_print.o
 obj-$(CONFIG_SSCANF) += sscanf.o
 obj-y += string.o