dosbox-staging: updates for 0.80

Added a few modifications needed to build & install the new 0.80 version:

 * Meson version needed is 0.57, which is not available in Debian _bullseye_ yet.
   Install 0.61.5 locally for the build step. This is the last version not requiring Python 3.7, which should cover Ubuntu 18.04 (still at 3.6)
 * Changed the install command to `ninja`, since `meson install` requires a system install for `meson` and thus install would fail when using the locally downloaded `meson`

The changes allow building and installing on Ubuntu 18.04, which was previously failing.

Notable changes from the Dosbox-Staging 0.80 release (excerpts from https://dosbox-staging.github.io/v0-80-0/):

 * ReelMagic DOS games are now playable thanks to the efforts of Jon Dennis, Chris Guthrie, and Joseph Whittaker, with testing and feedback from Vogons users Uka, DonutKing, and Vetz
 * Mouse emulation has been improved and now supports up to six independent mice, enabling split-screen play in games like The Settlers and The Settlers II
 * More settings, including video, audio, and MIXER effects, can now be changed on the fly
 * Post-rendered screenshots - use  Alt+F5 to capture the as-seen (post-rendered) image, in addition to the previous (Ctrl+F5) screenshot function that captured the emulated video card's image prior to rendering
 * More bundled OpenGL shaders. Launch DOSBox Staging with the --list-glshaders command-line argument to list the available OpenGL shaders
 * FluidSynth's specific reverb and chorus configuration settings are now applied and will replace the default values that were previously always applied
 * The modem's call now has a warm-up period where it will discard data

Author: cmitu

scriptmodules/emulators/dosbox-staging.sh

@@ -22,31 +22,34 @@ function _get_branch_dosbox-staging() {
 }
 
 function depends_dosbox-staging() {
-    getDepends cmake libasound2-dev libglib2.0-dev libopusfile-dev libpng-dev libsdl2-dev libsdl2-net-dev libspeexdsp-dev meson ninja-build
+    getDepends cmake libasound2-dev libglib2.0-dev libopusfile-dev libpng-dev libsdl2-dev libsdl2-net-dev libsdl2-image-dev libspeexdsp-dev meson ninja-build
 }
 
 function sources_dosbox-staging() {
     gitPullOrClone
-    # patch the dosbox-staging meson.build script to disable neon instructions for older arm
-    if ! isPlatform "neon"; then
-        applyPatch "$md_data/speexdsp_simd_disable.diff"
+    # Check if we have at least meson>=0.57, otherwise install it locally for the build
+    local meson_version="$(meson --version)"
+    if compareVersions "$meson_version" lt 0.57; then
+        downloadAndExtract "https://github.com/mesonbuild/meson/releases/download/0.61.5/meson-0.61.5.tar.gz" meson --strip-components 1
     fi
 }
 
 function build_dosbox-staging() {
     local params=(-Dprefix="$md_inst" -Ddatadir="resources")
+    # use the build local Meson installation if found
+    local meson_cmd="meson"
+    [[ -f "$md_build/meson/meson.py" ]] && meson_cmd="python3 $md_build/meson/meson.py"
 
-    meson setup "${params[@]}" build
-    meson compile -j${__jobs} -C build
+    $meson_cmd setup "${params[@]}" build
+    $meson_cmd compile -j${__jobs} -C build
 
     md_ret_require=(
         "$md_build/build/dosbox"
     )
 }
 
 function install_dosbox-staging() {
-    cd "$md_build/build"
-    meson install
+    ninja -C build install
 }
 
 function configure_dosbox-staging() {