xbps-src: add three new metadata objects in binary pkgs.

homepage (string): package upstream URL.
license (string): package licenses.
build_date (string): package build date in UTC.

xbps-src/shutils/metadata.sh

@@ -366,6 +366,22 @@ _EOF
 		echo "</array>" >> $TMPFPROPS
 	fi
 
+	# Build date.
+	echo "<key>build_date</key>" >> $TMPFPROPS
+	echo "<string>$(LANG=C date -u "+%A %d %B, %Y, %T UTC")</string>" >> $TMPFPROPS
+
+	# Homepage
+	if [ -n "$homepage" ]; then
+		echo "<key>homepage</key>" >> $TMPFPROPS
+		echo "<string>$homepage</string>" >> $TMPFPROPS
+	fi
+
+	# License
+	if [ -n "$license" ]; then
+		echo "<key>license</key>" >> $TMPFPROPS
+		echo "<string>$license</string>" >> $TMPFPROPS
+	fi
+
 	# Terminate the property list file.
 	echo "</dict>" >> $TMPFPROPS
 	echo "</plist>" >> $TMPFPROPS

xbps-src/shutils/tmpl_funcs.sh.in

@@ -104,6 +104,7 @@ reset_tmpl_vars()
 			ignore_vdeps_dir noverifyrdeps conflicts dkms_modules \
 			gconf_entries gconf_schemas stow_copy stow_copy_files \
 			pre_remove post_remove post_stow do_build do_install \
+			homepage license \
 			XBPS_EXTRACT_DONE XBPS_CONFIGURE_DONE \
 			XBPS_BUILD_DONE XBPS_INSTALL_DONE FILESDIR DESTDIR \
 			SRCPKGDESTDIR PATCHESDIR CFLAGS CXXFLAGS CPPFLAGS \