CI: disable pkg-config

to avoid it finding build machine packages

Author: lazka

.github/workflows/mingw.yml

@@ -197,6 +197,9 @@ jobs:
 
           mkdir _build && cd _build
 
+          export PKG_CONFIG_LIBDIR=/dev/null
+          unset PKG_CONFIG_PATH
+
           ../configure \
             --host=x86_64-w64-mingw32 \
             --build=x86_64-pc-linux-gnu \
@@ -259,6 +262,9 @@ jobs:
 
           mkdir _build && cd _build
 
+          export PKG_CONFIG_LIBDIR=/dev/null
+          unset PKG_CONFIG_PATH
+
           export CC=${{ matrix.arch }}-w64-mingw32-clang
           export CXX=${CC}++
           ../configure \