xterm: bump to 278

bump version and add project's URL

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/xterm/Config.in

@@ -6,3 +6,4 @@ config BR2_PACKAGE_XTERM
 	help
 	  xterm terminal emulator
 
+	  http://invisible-island.net/xterm/

package/xterm/xterm.mk

@@ -4,7 +4,7 @@
 #
 #############################################################
 
-XTERM_VERSION = 271
+XTERM_VERSION = 278
 XTERM_SOURCE = xterm-$(XTERM_VERSION).tgz
 XTERM_SITE = ftp://invisible-island.net/xterm
 XTERM_DEPENDENCIES = ncurses xlib_libXaw