Improve build templates by not having to set ${triggers} in some cases.

There's no need to update triggers in the following cases:
 * Packages installing stuff into /usr/share/applications.
 * Packages setting $gtk_iconcache_dirs.
 * Packages setting $font_dirs.
 * Packages setting ${sgml,xml}_entries.

--HG--
extra : convert_revision : 11c74b41f8cf474e9bf4dbb961b1aa9c6f6540bf

xbps-src/shutils/metadata.sh

@@ -346,16 +346,6 @@ _EOF
 	chmod 644 ${DESTDIR}/files.plist ${DESTDIR}/props.plist
 	[ -f $metadir/flist ] && chmod 644 $metadir/flist
 
-	#
-	# Update desktop-file-utils database if package contains
-	# any desktop file in /usr/share/applications.
-	#
-	if [ -d ${DESTDIR}/usr/share/applications ]; then
-		if find . -type f -name \*.desktop 2>&1 >/dev/null; then
-			triggers="$triggers update-desktopdb"
-		fi
-	fi
-
 	#
 	# Create the INSTALL/REMOVE scripts if package uses them
 	# or uses any available trigger.