efi_loader: move guidcmp to header

Want to re-use this for file protocol, which I'm working on.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 2abb6b8..7818e1c 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -168,6 +168,11 @@
 		*(unicode++) = *(ascii++);
 }
 
+static inline int guidcmp(const efi_guid_t *g1, const efi_guid_t *g2)
+{
+	return memcmp(g1, g2, sizeof(efi_guid_t));
+}
+
 /*
  * Use these to indicate that your code / data should go into the EFI runtime
  * section and thus still be available when the OS is running