[bugfix] Actually compile in version info into the library.

src/base/cl_version.cc: don't #include "cl_sysdep.h", so the version info
actually gets compiled into the library.

Due to the changes introduced in 7da4d3ae ("build: switch to ordinary auto*
tools system") including "cln/version.h" after "cl_config.h" is no-op (yes,
this is intended).

src/base/cl_version.cc

@@ -1,14 +1,6 @@
 // Version string buried into the library
-
-// General includes.
-#include "base/cl_sysdep.h"
-
-// Specification.
 #include "cln/version.h"
 
-
-// Implementation.
-
 namespace cln {
 
 const int version_major = CL_VERSION_MAJOR;