package/cups: bump to version 2.2.11 and add gzip fix

package/cups: bump to version 2.2.11 and add gzip fix

This patch bumps cups to version 2.2.11 so that an upstream fix will
apply cleanly.

The upstream fix corrects a build failure when GZIP is set in the
build environment, as it is for buildroot's reproducible builds, as
shown below:

gzip: /bin/gzip.gz: Permission denied
gzip: /bin/gzip.gz: Permission denied
Makefile:114: recipe for target 'install-data' failed

The patch will be included upstream in version 2.2.12.

Fixes:
 - http://autobuild.buildroot.net/results/c4e0f6a3c79c9cb083a08f811b7d4838efef50f9/

Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>