Bug#47867 compiler warning _WIN32_WINNT macro redefinition

 - Remove the conflicting macro definitions since we define a higher value
   directly in the cmake files.

extra/yassl/taocrypt/src/random.cpp

@@ -27,7 +27,6 @@
 #include <time.h>
 
 #if defined(_WIN32)
-    #define _WIN32_WINNT 0x0400
     #include <windows.h>
     #include <wincrypt.h>
 #else

mysql-test/lib/My/SafeProcess/safe_process_win.cc

@@ -50,9 +50,6 @@
            is killed.
 */
 
-/* Requires Windows 2000 or higher */
-#define _WIN32_WINNT 0x0500
-
 #include <windows.h>
 #include <stdio.h>
 #include <tlhelp32.h>