build,win: propagate error codes in vcbuild

Don't exit vcbuild with error code 0 when cctest fails.

Backport-PR-URL: #30726
PR-URL: #30724
Refs: nodejs/build#1996
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

vcbuild.bat

@@ -68,7 +68,8 @@ set no_cctest=
 set cctest=
 set openssl_no_asm=
 set doc=
-set extra_msbuild_args=^
+set extra_msbuild_args=
+set exit_code=0
 
 :next-arg
 if "%1"=="" goto args-done
@@ -559,9 +560,11 @@ if defined no_cctest echo Skipping cctest because no-cctest was specified && got
 if not exist "%config%\cctest.exe" echo cctest.exe not found. Run "vcbuild test" or "vcbuild cctest" to build it. && goto run-test-py
 echo running 'cctest %cctest_args%'
 "%config%\cctest" %cctest_args%
+if %errorlevel% neq 0 set exit_code=%errorlevel%
 :run-test-py
 echo running 'python tools\test.py %test_args%'
 python tools\test.py %test_args%
+if %errorlevel% neq 0 set exit_code=%errorlevel%
 goto test-v8
 
 :test-v8
@@ -672,7 +675,7 @@ echo   vcbuild.bat no-cctest                : skip building cctest.exe
 goto exit
 
 :exit
-goto :EOF
+exit /b %exit_code%
 
 
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