Added support to build subpackages from a single source.

proplib has been converted to see how it works.

--HG--
extra : convert_revision : dfcd1f547884108d69682e9e62b4aacfa431cc83

shutils/install_funcs.sh

@@ -73,6 +73,18 @@ install_src_phase()
 
 	touch -f $XBPS_INSTALL_DONE
 
+	#
+	# Build subpackages if found.
+	#
+	for subpkg in ${subpackages}; do
+		msg_normal "Preparing $pkgname subpackage: $pkgname-$subpkg"
+		. $XBPS_TEMPLATESDIR/$pkgname/$subpkg.template
+		pkgname=${sourcepkg}-${subpkg}
+		run_func do_install
+		run_template ${sourcepkg}
+	done
+	[ -n "$subpackages" ] && setup_tmpl ${sourcepkg}
+
 	#
 	# Remove $wrksrc if -C not specified.
 	#