libsmack: use bit array to reduce the size of struct cipso_mapping
libsmack: use bit array to reduce the size of struct cipso_mapping

To decrease size of struct cipso_mapping, categories are now stored in a
bit array. This reduces the size of the whole struct.
On a i386 machine it will occupy 292 bytes instead of 1004.

Change-Id: I5e9119ee822131cd0adcb479359a0693f094aee6
Signed-off-by: Rafal Krypa <875f2afab983118b44e45bad4cf04b04767e9f4a@samsung.com>

smack-team/smack,jobol/smack,smack-team/smack,jobol/smack