make distcheck: use latest dist tarball

Signed-off-by: Tzafrir Cohen <nvidia@cohens.org.il>

Author: tzafrir-mellanox

Makefile

@@ -12,7 +12,7 @@ dist:
 
 distcheck: dist
 	@set -e; set -x; \
-	tarball=`ls *.tar.gz | head -n 1`; \
+	tarball=`ls -t *.tar.gz | head -n 1`; \
 	rm -rf checkdir; \
 	mkdir checkdir; \
 	cd checkdir; \