Backport http://lists.mysql.com/commits/57778

2677 Vladislav Vaintroub	2008-11-04
CMakeLists.txt files cleanup
- remove SAFEMALLOC and SAFE_MUTEX definitions that were 
present in *each* CMakeLists.txt. Instead, put them into top level 
CMakeLists.txt, but disable on Windows, because
a) SAFEMALLOC does not add any functionality that is not already
present in Debug C runtime ( and 2 safe malloc one on top of the other 
only unnecessarily slows down the server) 
      
b)SAFE_MUTEX does not work on Windows  and have been
explicitely  disabled on Windows with #undef previously.  Fortunately,
ntdll does  pretty good  job identifying l problems with 
CRITICAL_SECTIONs.
DebugBreak()s on using uninited critical section, unlocking unowned 
critical section)
      
-Also, remove occationally used -D_DEBUG (added by compiler 
anyway)

sql/udf_example.c

@@ -138,11 +138,11 @@ typedef long long longlong;
 #endif
 #include <mysql.h>
 #include <ctype.h>
-
-#ifdef _WIN32
-/* inet_aton needs winsock library */
-#pragma comment(lib, "ws2_32")
-#endif
+
+#ifdef _WIN32
+/* inet_aton needs winsock library */
+#pragma comment(lib, "ws2_32")
+#endif
 
 static pthread_mutex_t LOCK_hostname;