GCC may have support for __has_feature but doesn't support __has_builtin

So perform these checks separately

format.h

@@ -61,9 +61,13 @@
 // Compatibility with compilers other than clang.
 #ifdef __has_feature
 # define FMT_HAS_FEATURE(x) __has_feature(x)
-# define FMT_HAS_BUILTIN(x) __has_builtin(x)
 #else
 # define FMT_HAS_FEATURE(x) 0
+#endif
+
+# ifdef __has_builtin
+# define FMT_HAS_BUILTIN(x) __has_builtin(x)
+#else
 # define FMT_HAS_BUILTIN(x) 0
 #endif