make.bat: exit if compilation failed

make.bat

@@ -1,7 +1,30 @@
+set exiterror=0
+@echo off
+
+echo Building V for Windows...
+
+if exist "vc" (
 rd /s /q vc
+)
+
 git version
 git clone --depth 1 --quiet https://github.com/vlang/vc
+
 gcc -std=gnu11 -DUNICODE -D_UNICODE -w -o v2.exe vc/v_win.c
+if %ERRORLEVEL% GEQ 1 (
+   goto :compileerror
+)
+
 v2.exe -o v.exe compiler
 del v2.exe
 rd /s /q vc
+
+
+:compileerror
+echo Failed to compile - Create an issue at 'https://github.com/vlang'
+goto :error
+
+
+:error
+echo fail
+exit /b 1