Fix the char* vs. const char* mismatch for the argument of aix_loaderror()

Python/dynload_aix.c

@@ -119,7 +119,7 @@
 }
 
 static void
-aix_loaderror(char *pathname)
+aix_loaderror(const char *pathname)
 {
 
 	char *message[1024], errbuf[1024];