package/zlib-ng: drop unrecognized CC variable
Drop unneeded CC variable which is not recognized by cmake:
CMake Warning:
Manually-specified variables were not used by the project:
BUILD_DOC
BUILD_DOCS
BUILD_EXAMPLE
BUILD_EXAMPLES
BUILD_TEST
BUILD_TESTING
BUILD_TESTS
CC
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 404efde6cbc87d26a192266ddc1b4c34d286b6c0)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>