[gobject-introspection] ci: ensure to use the downloaded pkg-config.exe

[Nirbheek Chauhan <nirbheekc src gnome org>]

commit 978c562383c057d324ffed9926bfcd9cd86172db
Author: Andoni Morales Alastruey <amorales fluendo com>
Date:   Thu Jan 27 16:38:44 2022 +0100

    ci: ensure to use the downloaded pkg-config.exe

 .gitlab-ci/test-msvc.bat | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci/test-msvc.bat b/.gitlab-ci/test-msvc.bat
index e2885a4a..bf0d7500 100644
--- a/.gitlab-ci/test-msvc.bat
+++ b/.gitlab-ci/test-msvc.bat
@@ -8,6 +8,8 @@ py -3 -m zipfile -e win_flex_bison.zip win_flex_bison
 py -3 -c "import urllib.request, sys; urllib.request.urlretrieve(*sys.argv[1:])" 
"https://nirbheek.in/files/binaries/pkg-config/win32/pkg-config.exe"; pkg-config.exe
 
 SET PATH=%CD%;%CD%\win_flex_bison;%PATH%
+SET PKG_CONFIG=%CD%\pkg-config.exe
+SET PKG_CONFIG_PATH=%CD%\_build\meson-uninstalled
 
 pip3 install --upgrade --user meson==0.58.2 || goto :error