bind: security bump to version 9.11.5

Fixes the following security issues:

- CVE-2018-5738: Some versions of BIND can improperly permit recursive query
  service to unauthorized clients

- CVE-2018-5740: A flaw in the "deny-answer-aliases" feature can cause an
  INSIST assertion failure in named

For more details, see the release notes:

https://ftp.isc.org/isc/bind9/9.11.5/RELEASE-NOTES-bind-9.11.5.html

Drop patch 0003-Rename-ptrsize-to-ptr_size.patch as the uClibc-ng issue was
fixed upstream in commit 931fd627f6195 (mips: fix clashing symbols), which
is included in uclibc-1.0.12 (January 2016).

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

package/bind/bind.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-BIND_VERSION = 9.11.4-P2
+BIND_VERSION = 9.11.5
 BIND_SITE = http://ftp.isc.org/isc/bind9/$(BIND_VERSION)
 # bind does not support parallel builds.
 BIND_MAKE = $(MAKE1)