package/cmake: not available on static-only build

Fixes:
  http://autobuild.buildroot.net/results/9f7/9f7c8d5078cd1f3cd493f9ae8e95c8ee728f98fd/

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
1 file changed