ci/install-{gst, gtk}: update meson command usage

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1176>

ci/install-gst.sh

@@ -22,7 +22,7 @@ PLUGINS="-D gst-plugins-base:ogg=enabled \
          -D gst-plugins-bad:opus=enabled \
          -D gst-plugins-ugly:x264=enabled"
 
-meson build \
+meson setup build \
     -D prefix=/usr/local \
     -D gpl=enabled \
     -D ugly=enabled \
@@ -33,8 +33,8 @@ meson build \
     -D python=disabled \
     -D vaapi=disabled \
     $PLUGINS
-ninja -C build
-ninja -C build install
+meson compile -C build
+meson install -C build
 
 cd ..
 rm -rf gstreamer/

ci/install-gtk4.sh

@@ -7,11 +7,11 @@ BRANCH=4.8.2
 git clone https://gitlab.gnome.org/GNOME/gtk.git --branch $BRANCH --depth=1
 cd gtk
 
-meson build \
+meson setup build \
     -D prefix=/usr/local \
     -Dbuild-tests=false  \
     -Dwayland-protocols:tests=false
-ninja -C build
-ninja -C build install
+meson compile -C build
+meson install -C build
 cd ..
 rm -rf gtk/

ci/windows-docker/install_gst.ps1

@@ -48,7 +48,7 @@ $env:MESON_ARGS = "--prefix=C:\gst-install\ " +
     "-Dgst-plugins-good:lame=disabled "
 
 Write-Output "Building gst"
-cmd.exe /C "C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=amd64 && meson _build $env:MESON_ARGS && meson compile -C _build && ninja -C _build install"
+cmd.exe /C "C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=amd64 && meson setup _build $env:MESON_ARGS && meson compile -C _build && meson install -C _build"
 
 if (!$?) {
   Write-Host "Failed to build and install gst"