restore ue compilation with ocp-softmodem, some RF simulator improvement

executables/main-fs6.c

executables/main-ocp.c

executables/split_headers.h

openair1/PHY/LTE_TRANSPORT/transport_eNB.h

openair1/PHY/LTE_UE_TRANSPORT/dlsch_decoding.c

openair1/PHY/defs_eNB.h

openair2/UTIL/MEM/mem_block.c

openair2/UTIL/MEM/mem_block.h

openair2/UTIL/MEM/mem_mngt.c

openair2/UTIL/MEM/mem_mngt_proto_extern.h

openair2/UTIL/MEM/mem_pool.h

targets/ARCH/rfsimulator/simulator.c

targets/RT/USER/lte-enb.c

targets/RT/USER/lte-ru.c

targets/RT/USER/lte-ue.c

targets/RT/USER/lte-uesoftmodem.c