Removed some unused source files

- I don't believe there's a need to keep them if we're not using them.
  If and when we will ever need them again, this commit can be easily
  reverted.

Signed-off-by: Haru <haru@dotalux.com>

src/common/CMakeLists.txt

@@ -84,8 +84,6 @@ set( COMMON_BASE_HEADERS
 	"${COMMON_SOURCE_DIR}/spinlock.h"
 	"${COMMON_SOURCE_DIR}/thread.h"
 	"${COMMON_SOURCE_DIR}/mutex.h"
-	"${COMMON_SOURCE_DIR}/raconf.h"
-	"${COMMON_SOURCE_DIR}/mempool.h"
 	${LIBCONFIG_HEADERS} # needed by conf.h/showmsg.h
 	CACHE INTERNAL "common_base headers" )
 set( COMMON_BASE_SOURCES
@@ -109,8 +107,6 @@ set( COMMON_BASE_SOURCES
 	"${COMMON_SOURCE_DIR}/utils.c"
 	"${COMMON_SOURCE_DIR}/thread.c"
 	"${COMMON_SOURCE_DIR}/mutex.c"
-	"${COMMON_SOURCE_DIR}/mempool.c"
-	"${COMMON_SOURCE_DIR}/raconf.c"
 	${LIBCONFIG_SOURCES} # needed by conf.c/showmsg.c
 	CACHE INTERNAL "common_base sources" )
 set( COMMON_BASE_INCLUDE_DIRS