libbpf: Update to v1.4.2

Update to the latest upstream release to include recent improvements and
bugfixes.

Link: https://github.com/libbpf/libbpf/releases/tag/v1.4.2
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>

package/libs/libbpf/Makefile

@@ -8,13 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libbpf
-PKG_VERSION:=1.4.1
+PKG_VERSION:=1.4.2
 PKG_RELEASE:=1
 
 PKG_SOURCE_URL:=https://github.com/libbpf/libbpf
-PKG_MIRROR_HASH:=46469f720ed246529e46d84a6444ae1c1a1eaf2a717a5a055c9973bb52159ec3
+PKG_MIRROR_HASH:=eaf56a8d4297a1dfb477d91b4fb7c7c5ad6b6df73e0f7ac3c8fd93f2664c2e85
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_VERSION:=v1.4.1
+PKG_SOURCE_VERSION:=v1.4.2
 PKG_ABI_VERSION:=$(firstword $(subst .,$(space),$(PKG_VERSION)))
 
 PKG_MAINTAINER:=Tony Ambardar <itugrok@yahoo.com>