- Moved Makerules to OPENAIR_TARGETS

- Created Makefile.common that gathers common definitions for oaisim and lte-softmodem
- Added ITTI capabilities to lte-softmodem (currently not stable)
	* Created dummy l2l1 task
	* Added -K option to output itti messages to file (some RT issues with file flush)
- Added S1AP/SCTP tasks in lte-softmodem

pre-ci ok
lte-softmodem with HARD_RT=1 build ok

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4514 818b1a75-f10b-46b9-bf7c-635c3b92a50f