make sure the patch cmd pass

Author: mvorisek

.github/scripts/windows/build_task.bat

@@ -52,6 +52,7 @@ if "%INTRINSICS%" neq "" set ADD_CONF=%ADD_CONF% --enable-native-intrinsics=%INT
 set CFLAGS=/W1 /WX
 
 patch --binary %DEPS_DIR%\include\net-snmp\net-snmp-config.h -i %~dp0net-snmp-config.h.patch.bin
+if %errorlevel% neq 0 exit /b 3
 
 cmd /c configure.bat ^
 	--enable-snapshot-build ^