more portable fix for lp:942266 - 5.5 builds fail with systemtap-sdt-dev installed on Ubuntu

include <limits> early, before min/max macros are defined.

include/my_global.h

@@ -1429,6 +1429,10 @@ static inline char *dlerror(void)
 /* Length of decimal number represented by INT64. */
 #define MY_INT64_NUM_DECIMAL_DIGITS 21
 
+#ifdef __cplusplus
+#include <limits> /* should be included before min/max macros */
+#endif
+
 /* Define some useful general macros (should be done after all headers). */
 #if !defined(max)
 #define max(a, b)	((a) > (b) ? (a) : (b))

include/probes_mysql.h

@@ -18,28 +18,8 @@
 
 #define PROBES_MYSQL_H
 
-
 #if defined(HAVE_DTRACE) && !defined(DISABLE_DTRACE)
-
-#ifdef __linux__
-/* 
-  On Linux, generated probes header may include C++ header
-  <limits> which conflicts with min and max macros from my_global.h .
-  To fix, temporarily undefine the macros.
-*/
-#pragma push_macro("min")
-#pragma push_macro("max")
-#undef min
-#undef max
-#endif
-
 #include "probes_mysql_dtrace.h"
-
-#ifdef __linux__
-#pragma pop_macro("min")
-#pragma pop_macro("max")
-#endif
-
 #else  /* no dtrace */
 #include "probes_mysql_nodtrace.h"
 #endif