Added libdl to the OS libraries needed, for dlopen/dlsym.

configure/os/CONFIG.Common.linuxCommon

@@ -20,7 +20,7 @@ POSIX_LDLIBS = -lpthread
 # -D_BSD_SOURCE for gethostname() in unistd.h as needed by cacChannelIO.cpp.
 OP_SYS_CPPFLAGS += -D_BSD_SOURCE
 OP_SYS_CPPFLAGS += -Dlinux
-OP_SYS_LDLIBS += -lrt
+OP_SYS_LDLIBS += -lrt -ldl
 
 # Set runtime path for shared libraries
 SHRLIBDIR_LDFLAGS += $(SHRLIB_DEPLIB_DIRS:%=-Wl,-rpath,%)