Bug#52514: mysql 5.1 do_abi_check does not compile w/ gcc4.5

due to GCC preprocessor change
      
The problem is that newer GCC versions treats missing headers
as fatal errors. The solution is to use a guard macro to prevent
the inclusion of system headers when checking the ABI with the
C Preprocessor.

Reference: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15638
           http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44836

include/mysql.h

@@ -44,7 +44,9 @@ extern "C" {
 #endif
 
 #ifndef _global_h				/* If not standard header */
+#ifndef MYSQL_ABI_CHECK
 #include <sys/types.h>
+#endif
 #ifdef __LCC__
 #include <winsock2.h>				/* For windows */
 #endif