unzip: add missing CVE headers to patches

(From OE-Core rev: de7ff341d18f46d68abeabcb53ba07d012090c15)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/unzip/unzip/18-cve-2014-9913-unzip-buffer-overflow.patch

@@ -6,7 +6,7 @@ Bug-Ubuntu: https://launchpad.net/bugs/387350
 X-Debian-version: 6.0-21
 
 Upstream-Status: Backport
-
+CVE: CVE-2014-9913
 Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
 
 --- a/list.c

meta/recipes-extended/unzip/unzip/19-cve-2016-9844-zipinfo-buffer-overflow.patch

@@ -5,7 +5,7 @@ Bug-Ubuntu: https://launchpad.net/bugs/1643750
 X-Debian-version: 6.0-21
 
 Upstream-Status: Backport
-
+CVE: CVE-2016-9844
 Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
 
 --- a/zipinfo.c