games/mgba: Updated for version 0.3.1.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

games/mgba/README

@@ -2,9 +2,18 @@ mGBA is an emulator for running Game Boy Advance games. It aims to be
 faster and more accurate than many existing Game Boy Advance
 emulators, as well as adding features that other emulators lack.
 
-Optional dependencies are:
+The following optional dependencies will be automatically detected.
 
-* qt5 (for the GUI)
 * SDL2
 * libedit (for the command-line debugger)
 * ffmpeg
+
+If you have Qt 5 and CMake 3, then you can build mGBA with a GUI:
+
+    QT=on ./mGBA.SlackBuild
+
+As an alternative to running mGBA as an application, you might consider
+running RetroArch with its mGBA core. RetroArch SlackBuilds, including
+one for its mGBA core, are here:
+
+	https://github.com/duganchen/slackware-libretro

games/mgba/mgba.SlackBuild

@@ -23,7 +23,7 @@
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 PRGNAM=mgba
-VERSION=${VERSION:-0.3.0}
+VERSION=${VERSION:-0.3.1}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 
@@ -40,6 +40,9 @@ TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}
 
+# Set to on to build the Qt GUI. Requires Qt 5 and CMake 3.
+QT=${QT:-off}
+
 if [ "$ARCH" = "i486" ]; then
   SLKCFLAGS="-O2 -march=i486 -mtune=i686"
   LIBDIRSUFFIX=""
@@ -77,6 +80,7 @@ cd build
     -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
 	-DCMAKE_INSTALL_PREFIX=/usr \
 	-DLIBDIR=lib$LIBDIRSUFFIX \
+	-DBUILD_QT=${QT} \
     -DCMAKE_BUILD_TYPE=Release ..
   make
   make install DESTDIR=$PKG

games/mgba/mgba.info

@@ -1,8 +1,8 @@
 PRGNAM="mgba"
-VERSION="0.3.0"
+VERSION="0.3.1"
 HOMEPAGE="https://endrift.com/mgba/"
-DOWNLOAD="https://github.com/mgba-emu/mgba/archive/0.3.0.tar.gz"
-MD5SUM="56caa5bf92d8549cb64b9e490d62bd42"
+DOWNLOAD="https://github.com/mgba-emu/mgba/archive/0.3.1.tar.gz"
+MD5SUM="870f516bd5433f01fec4fa4c26079e0f"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""
 REQUIRES=""