Merge topic 'aix-gcc-2.9-issue-12233'

a4cba0e Fix plugin API for gcc 2.9-aix51-020209 (#12233)

Source/cmCPluginAPI.cxx

@@ -518,7 +518,7 @@ public:
 };
 cmCPluginAPISourceFileMap cmCPluginAPISourceFiles;
 
-void * CCONV cmCreateSourceFile()
+void * CCONV cmCreateSourceFile(void)
 {
   return (void*)new cmCPluginAPISourceFile;
 }