recipes-gnome: Add Summary and Description information

Add Summary and update description information as necessary.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>

meta-demoapps/recipes-gnome/libgsf/libgsf_1.14.5.bb

@@ -1,3 +1,4 @@
+DESCRIPTION = "GNOME Structured File Library"
 LICENSE = "GPL"
 SECTION = "libs"
 PR = "r0"

meta/recipes-gnome/gtk+/gtk+.inc

@@ -1,3 +1,4 @@
+SUMMARY = "Multi-platform toolkit for creating GUIs"
 DESCRIPTION = "GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete \
 set of widgets, GTK+ is suitable for projects ranging from small one-off projects to complete application suites."
 HOMEPAGE = "http://www.gtk.org"

meta/recipes-gnome/gtk-doc/gtk-doc.bb

@@ -1,3 +1,7 @@
+SUMMARY = "API documentation generation tool for GTK+ and GNOME"
+DESCRIPTION = "gtk-doc is a tool for generating API reference documentation. \
+It is used for generating the documentation for GTK+, GLib \
+and GNOME."
 SECTION = "x11/base"
 SRC_URI = "file://gtk-doc.m4"
 LICENSE = "LGPL"

meta/recipes-gnome/libffi/libffi_3.0.9.bb

@@ -1,3 +1,10 @@
+SUMMARY = "A portable foreign function interface library"
+DESCRIPTION = "The `libffi' library provides a portable, high level programming interface to various calling \
+conventions.  This allows a programmer to call any function specified by a call interface description at run \
+time. FFI stands for Foreign Function Interface.  A foreign function interface is the popular name for the \
+interface that allows code written in one language to call code written in another language.  The `libffi' \
+library really only provides the lowest, machine dependent layer of a fully featured foreign function interface.  \
+A layer must exist above `libffi' that handles type conversions for values passed between the two languages."
 SRC_URI = "ftp://sourceware.org/pub/libffi/${BPN}-${PV}.tar.gz"
 
 SRC_URI[md5sum] = "1f300a7a7f975d4046f51c3022fa5ff1"