deps/libgit2: add/prep for new version but do not enable it

To enable we need to update cargo.

recipes-deps/libgit2/libgit2.inc

@@ -2,10 +2,6 @@ SUMMARY = "the Git linkable library"
 HOMEPAGE = "http://libgit2.github.com/"
 LICENSE = "GPL-2.0-with-linking-exception"
 
-LIC_FILES_CHKSUM = "\
-	file://COPYING;md5=29c24df0df4c2bab5efb8d5a33a73202 \
-"
-
 DEPENDS = "zlib"
 
 inherit cmake