contib: build libgit2 without CLI

avoids build issue in some cases

Change-Id: I857b1ccd1419823ee9c415d4ffeedb084258f51c

contrib/src/libgit2/rules.mak

@@ -25,6 +25,7 @@ libgit2: libgit2-v$(LIBGIT2_VERSION).tar.gz .sum-libgit2
 LIBGIT2_CONF = -DCMAKE_BUILD_TYPE=Release \
 		-DBUILD_SHARED_LIBS=OFF \
 		-DBUILD_TESTS=OFF \
+		-DBUILD_CLI=OFF \
 		-DUSE_HTTPS=OFF \
 		-DCURL=OFF \
 		-DUSE_HTTP_PARSER=system \