gpt: it's __mips64, not __mips64__

But it's __mips__ not __mips, obviously

Follow-up for d75ec33

(cherry picked from commit 10ad311)
(cherry picked from commit 9c66d0c)

Author: bluca

src/systemd/sd-gpt.h

@@ -223,7 +223,7 @@ _SD_BEGIN_DECLARATIONS;
 #  define SD_GPT_USR_NATIVE SD_GPT_USR_MIPS_LE
 #  define SD_GPT_USR_NATIVE_VERITY SD_GPT_USR_MIPS_LE_VERITY
 #  define SD_GPT_USR_NATIVE_VERITY_SIG SD_GPT_USR_MIPS_LE_VERITY_SIG
-#elif defined(__mips64__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#elif defined(__mips64) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 #  define SD_GPT_ROOT_NATIVE SD_GPT_ROOT_MIPS64_LE
 #  define SD_GPT_ROOT_NATIVE_VERITY SD_GPT_ROOT_MIPS64_LE_VERITY
 #  define SD_GPT_ROOT_NATIVE_VERITY_SIG SD_GPT_ROOT_MIPS64_LE_VERITY_SIG