libraries/appstream-glib: Remove useless meson option.

This also fails on newer versions of meson instead of just being a
warning.

Signed-off-by: Andrew Clemons <andrew.clemons@gmail.com>

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

libraries/appstream-glib/appstream-glib.SlackBuild

@@ -28,7 +28,7 @@ cd $(dirname $0) ; CWD=$(pwd)
 PRGNAM=appstream-glib
 VERSION=${VERSION:-0.8.3}
 SRCVERSION=$(echo "$PRGNAM" | tr - _)_$(echo "$VERSION" | tr . _)
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
 
@@ -88,7 +88,6 @@ meson \
   --sysconfdir=/etc \
   --mandir=/usr/man \
   -Dgtk-doc=true \
-  -Dstemmer=false \
   ..
 
 "${NINJA:=ninja}"