libgtk2: bump to version 2.24.27

Also add hash file.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libgtk2/libgtk2.hash

@@ -0,0 +1,2 @@
+# From http://ftp.gnome.org/pub/gnome/sources/gtk+/2.24/gtk+-2.24.27.sha256sum
+sha256	20cb10cae43999732a9af2e9aac4d1adebf2a9c2e1ba147050976abca5cd24f4	gtk+-2.24.27.tar.xz

package/libgtk2/libgtk2.mk

@@ -5,8 +5,7 @@
 ################################################################################
 
 LIBGTK2_VERSION_MAJOR = 2.24
-LIBGTK2_VERSION = $(LIBGTK2_VERSION_MAJOR).18
-
+LIBGTK2_VERSION = $(LIBGTK2_VERSION_MAJOR).27
 LIBGTK2_SOURCE = gtk+-$(LIBGTK2_VERSION).tar.xz
 LIBGTK2_SITE = http://ftp.gnome.org/pub/gnome/sources/gtk+/$(LIBGTK2_VERSION_MAJOR)
 LIBGTK2_INSTALL_STAGING = YES