py/mpconfig: Move MICROPY_VERSION macros to static ones in mpconfig.h.

It's more robust to have the version defined statically in a header file,
rather than dynamically generating it via git using a git tag.  In case
git doesn't exist, or a different source control tool is used, it's
important to still have the uPy version number available.

py/modsys.c

@@ -37,8 +37,6 @@
 
 #if MICROPY_PY_SYS
 
-#include "genhdr/mpversion.h"
-
 // defined per port; type of these is irrelevant, just need pointer
 extern struct _mp_dummy_t mp_sys_stdin_obj;
 extern struct _mp_dummy_t mp_sys_stdout_obj;