msvc-go-wine: don't hard-fail devcmd setup when the bundled CMake/Ninja is missing.

Same reasoning as the ConnectionManagerExe fix: a missing optional
component shouldn't abort the whole Developer Command Prompt setup.

diff --git a/Common7/Tools/vsdevcmd/ext/cmake.bat b/Common7/Tools/vsdevcmd/ext/cmake.bat
index d9a1088..584f141 100644
--- a/Common7/Tools/vsdevcmd/ext/cmake.bat
+++ b/Common7/Tools/vsdevcmd/ext/cmake.bat
@@ -10,7 +10,7 @@ set "PATH=%PATH%;%VSINSTALLDIR%Common7\IDE\CommonExtensions\Microsoft\CMake\CMak
 goto :end
 
 :error_setting_path
-exit /B 1
+exit /B 0
 
 goto :end