Revert "multipath-tools tests: gpt: fix compilation errors on old compilers"

This reverts commit f95f7d7.

Author: mwilck

tests/gpt.c

@@ -115,8 +115,9 @@ static uint32_t efi_crc32(const void *buf, size_t len)
 #define FLAG_VALID_PMBR           (1U << 5)
 
 /* Linux data partition type GUID */
-static efi_guid_t linux_data_guid;
-
+static const efi_guid_t linux_data_guid =
+	EFI_GUID(0x0FC63DAF, 0x8483, 0x4772, 0x8E, 0x79, 0x3D, 0x69, 0xD8,
+		 0x47, 0x7D, 0xE4);
 
 /*
  * Build an in-memory GPT disk image and return an open memfd.
@@ -702,7 +703,5 @@ int main(void)
 		cmocka_unit_test(test_gpt_257_entries),
 		cmocka_unit_test(test_gpt_1025_entries),
 	};
-	linux_data_guid = EFI_GUID(0x0FC63DAF, 0x8483, 0x4772, 0x8E, 0x79,
-				   0x3D, 0x69, 0xD8, 0x47, 0x7D, 0xE4);
 	return cmocka_run_group_tests(tests, group_setup, group_teardown);
 }