libvncserver: security bump to version 0.9.11

Security related fixes:
- Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer
  before 0.9.11 (CVE-2016-9941)

- Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer
  before 0.9.11 (CVE-2016-9942)

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libvncserver/libvncserver.hash

@@ -1,2 +1,2 @@
 # Locally computed:
-sha256  ed10819a5bfbf269969f97f075939cc38273cc1b6d28bccfb0999fba489411f7  LibVNCServer-0.9.10.tar.gz
+sha256  193d630372722a532136fd25c5326b2ca1a636cbb8bf9bb115ef869c804d2894  LibVNCServer-0.9.11.tar.gz

package/libvncserver/libvncserver.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBVNCSERVER_VERSION = 0.9.10
+LIBVNCSERVER_VERSION = 0.9.11
 LIBVNCSERVER_SOURCE = LibVNCServer-$(LIBVNCSERVER_VERSION).tar.gz
 LIBVNCSERVER_SITE = https://github.com/LibVNC/libvncserver/archive
 LIBVNCSERVER_LICENSE = GPLv2+