[glib-networking/windows-ci: 1/2] gitlab: remove build dir before building

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 34f86ec856048f25b976c87362dd4aef3d62d0ac
Author: Ignacio Casal Quinteiro <qignacio amazon com>
Date:   Sat Mar 28 08:35:45 2020 +0100

    gitlab: remove build dir before building

 .gitlab-ci/test-msvc.bat | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci/test-msvc.bat b/.gitlab-ci/test-msvc.bat
index 3c501ca..f47a755 100644
--- a/.gitlab-ci/test-msvc.bat
+++ b/.gitlab-ci/test-msvc.bat
@@ -5,6 +5,7 @@ call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary
 @echo on
 
 set BUILD_DIR=c:\gnet
+@RD /S /Q %BUILD_DIR%
 
 git clone --depth 1 https://github.com/wingtk/gvsbuild.git || goto :error