Fix macro check build failure

Author: wxmerkt

include/hpp/fcl/fwd.hh

@@ -95,7 +95,7 @@
 #define HPP_FCL_COMPILER_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop")
 #define HPP_FCL_COMPILER_DIAGNOSTIC_IGNORED_DEPRECECATED_DECLARATIONS \
   _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
-#if !defined(__has_warning) || __has_warning("-Wmaybe-uninitialized")
+#if defined(__has_warning) && __has_warning("-Wmaybe-uninitialized")
 #define HPP_FCL_COMPILER_DIAGNOSTIC_IGNORED_MAYBE_UNINITIALIZED \
   _Pragma("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
 #else