build,win: fix goto exit in vcbuild

PR-URL: #30931
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

vcbuild.bat

@@ -717,6 +717,7 @@ echo   vcbuild.bat no-cctest                : skip building cctest.exe
 goto exit
 
 :exit
+if %errorlevel% neq 0 exit /b %errorlevel%
 exit /b %exit_code%