bsdiff: Add patches for CVEs

Add two patches from Debian fixing CVEs in the bsdiff application.
CVE-2014-9862: Heap vulnerability in bspatch
CVE-2020-14315: Memory Corruption Vulnerability in bspatch

Copied the patches from this location:
https://salsa.debian.org/debian/bsdiff/-/blob/debian/latest/debian/patches/20-CVE-2014-9862.patch
https://salsa.debian.org/debian/bsdiff/-/blob/debian/latest/debian/patches/33-CVE-2020-14315.patch

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/utils/bsdiff/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=bsdiff
 PKG_VERSION:=4.3
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://www.daemonology.net/bsdiff/