Makefile: opensuse 15.0 reporting change

A change in /etc/os-release reporting for opensuse leap15.0
means this change is required so that builds are allowed.

Change-Id: I35fb55a4c63b5d6d9d313c7e75ff6b039280df96
Signed-off-by: Ed Kern <ejk@cisco.com>
diff --git a/Makefile b/Makefile
index 5b5616d..15c2cf9 100644
--- a/Makefile
+++ b/Makefile
@@ -297,6 +297,9 @@
 else ifeq ($(filter opensuse-leap,$(OS_ID)),$(OS_ID))
 	@sudo -E zypper refresh
 	@sudo -E zypper install -y $(RPM_SUSE_DEPENDS)
+else ifeq ($(filter opensuse,$(OS_ID)),$(OS_ID))
+	@sudo -E zypper refresh
+	@sudo -E zypper install -y $(RPM_SUSE_DEPENDS)
 else
 	$(error "This option currently works only on Ubuntu, Debian, Centos or openSUSE systems")
 endif