CI: introduce setup-msys2@v2 setup action (OSGeo#2508)

Thanks @nilason, @neteler and @hellik for your feedback. It has indeed been a build env issue.
Will create a follow up PR for backporting...

* use msys2-setup

* specify location

* get OSGeo4W includes for cairo

* try to deactivate fontconfig

* remove msys2 cairo

* link osgeo4w cairo

* link osgeo4w cairo libs

* no fontconfig

.github/workflows/osgeo4w.yml

@@ -27,6 +27,12 @@ jobs:
           git config --global core.autocrlf false
           git config --global core.eol lf
       - uses: actions/checkout@v2
+      - uses: msys2/setup-msys2@v2
+        with:
+          path-type: inherit
+          location: D:\
+          update: true
+          install: tar libintl make bison flex diffutils git dos2unix zip mingw-w64-x86_64-toolchain mingw-w64-x86_64-fftw mingw-w64-x86_64-lapack mingw-w64-x86_64-pkgconf mingw-w64-x86_64-gcc mingw-w64-x86_64-ccache mingw-w64-x86_64-zlib mingw-w64-x86_64-libiconv mingw-w64-x86_64-bzip2 mingw-w64-x86_64-gettext mingw-w64-x86_64-libsystre mingw-w64-x86_64-libtre-git mingw-w64-x86_64-libwinpthread-git mingw-w64-x86_64-libpng mingw-w64-x86_64-pcre mingw-w64-x86_64-python3-six
 
       - name: Install OSGeo4W
         run: |
@@ -35,17 +41,14 @@ jobs:
           (New-Object System.Net.WebClient).DownloadFile($url, $exe)
           Start-Process ('.\'+$exe) -ArgumentList '-A -g -k -q -s http://download.osgeo.org/osgeo4w/v2/ -P proj-devel,gdal-devel,geos-devel,libtiff-devel,libpng-devel,pdal-devel,netcdf-devel,cairo-devel,fftw,freetype-devel,gdal-ecw,gdal-mrsid,liblas-devel,libxdr,libpq-devel,pdcurses,python3-matplotlib,python3-numpy,python3-ply,python3-pywin32,python3-six,python3-wxpython,regex-devel,wxwidgets-devel,zstd-devel' -Wait
 
-      - name: Install MSYS2 packages
-        run: C:\msys64\usr\bin\pacman.exe --noconfirm -S tar libintl make bison flex diffutils git dos2unix zip mingw-w64-x86_64-toolchain mingw-w64-x86_64-cairo mingw-w64-x86_64-fftw mingw-w64-x86_64-lapack mingw-w64-x86_64-pkg-config mingw-w64-x86_64-gcc mingw-w64-x86_64-ccache mingw-w64-x86_64-zlib mingw-w64-x86_64-libiconv mingw-w64-x86_64-bzip2 mingw-w64-x86_64-gettext mingw-w64-x86_64-libsystre mingw-w64-x86_64-libtre-git mingw-w64-x86_64-libwinpthread-git mingw-w64-x86_64-libpng mingw-w64-x86_64-pcre mingw-w64-x86_64-python3-six
-
       - name: Compile GRASS GIS
-        run: C:\msys64\usr\bin\bash.exe -l (''+(Get-Location)+'\.github\workflows\build_osgeo4w.sh') (Get-Location)
+        run: D:\msys64\usr\bin\bash.exe -l (''+(Get-Location)+'\.github\workflows\build_osgeo4w.sh') (Get-Location)
 
       - name: Test executing of the grass command
         run: .github/workflows/test_simple.bat 'C:\OSGeo4W\opt\grass\grass83.bat'
 
       - name: Test executing of the grass command in bash
-        run: C:\msys64\usr\bin\bash.exe .github/workflows/test_simple.sh
+        run: D:\msys64\usr\bin\bash.exe .github/workflows/test_simple.sh
 
       - name: Run tests
         run: .github/workflows/test_thorough.bat 'C:\OSGeo4W\opt\grass\grass83.bat' 'C:\OSGeo4W\bin\python3'

mswindows/osgeo4w/build_osgeo4w.sh

@@ -49,7 +49,7 @@ export ARCH=x86_64-w64-mingw32
     --with-blas \
     --with-lapack-includes=/mingw64/include/lapack \
     --with-freetype \
-    --with-freetype-includes=/mingw64/include/freetype2 \
+    --with-freetype-includes=${OSGEO4W_ROOT_MSYS}/include/freetype2 \
     --with-proj-share=${OSGEO4W_ROOT_MSYS}/share/proj \
     --with-proj-includes=${OSGEO4W_ROOT_MSYS}/include \
     --with-proj-libs=${OSGEO4W_ROOT_MSYS}/lib \
@@ -66,8 +66,9 @@ export ARCH=x86_64-w64-mingw32
     --with-zstd \
     --with-odbc \
     --with-cairo \
-    --with-cairo-includes=${SRC}/include \
-    --with-cairo-ldflags="-L${SRC}/mswindows/osgeo4w/lib -lcairo -lfontconfig" \
+    --with-cairo-includes=${OSGEO4W_ROOT_MSYS}/include \
+    --with-cairo-libs=$OSGEO4W_ROOT_MSYS/lib \
+    --with-cairo-ldflags="-L${SRC}/mswindows/osgeo4w/lib -lcairo" \
     --with-opengl=windows \
     --with-bzlib \
     --with-liblas=${SRC}/mswindows/osgeo4w/liblas-config \