Add unit testcase for thread-pool.

Extract thread-pool into a separate CMake library.
Extract utils into a separate CMake library.

CMakeLists.txt

@@ -651,13 +651,7 @@ include_directories(${OPENAIR_DIR}/common/utils/hashtable)
 
 add_library(UTIL
   ${OPENAIR_DIR}/common/utils/LOG/vcd_signal_dumper.c
-  ${OPENAIR2_DIR}/UTIL/MATH/oml.c
   ${OPENAIR2_DIR}/UTIL/OPT/probe.c
-  ${OPENAIR_DIR}/common/utils/threadPool/thread-pool.c
-  ${OPENAIR_DIR}/common/utils/utils.c
-  ${OPENAIR_DIR}/common/utils/system.c
-  ${OPENAIR_DIR}/common/utils/time_meas.c
-  ${OPENAIR_DIR}/common/utils/time_stat.c
 )
 if (ENABLE_LTTNG)
   find_package(LTTngUST 2.3.8 EXACT REQUIRED)
@@ -671,7 +665,7 @@ if (cap_FOUND)
   target_link_libraries(UTIL PRIVATE cap)
   target_compile_definitions(UTIL PRIVATE HAVE_LIB_CAP)
 endif()
-target_link_libraries(UTIL PUBLIC ${T_LIB} pthread LOG)
+target_link_libraries(UTIL PUBLIC ${T_LIB} pthread LOG thread-pool utils)
 
 set(SECURITY_SRC
   ${OPENAIR3_DIR}/SECU/secu_defs.c
@@ -1206,7 +1200,7 @@ set(PHY_MEX_UE
   ${OPENAIR1_DIR}/PHY/LTE_ESTIMATION/lte_ue_measurements.c
   )
 add_library(PHY_MEX ${PHY_MEX_UE})
-target_link_libraries(PHY_MEX PRIVATE asn1_lte_rrc_hdrs LOG)
+target_link_libraries(PHY_MEX PRIVATE asn1_lte_rrc_hdrs UTIL)
 
 #Layer 2 library
 #####################