Use typedef for EMACS_INT, EMACS_UINT.

Use typedef for EMACS_INT, EMACS_UINT.

* lisp.h, s/ms-w32.h (EMACS_INT, EMACS_UINT): Use typedefs rather
than macros.  This simplifies debugging in the usual case, since
it lets GDB show addresses as 'EMACS_INT *' rather than 'long int *'
and it allows expressions involving EMACS_INT casts.
* .gdbinit (xreload): Simplify by using EMACS_INT cast.