bug#15880: Compute C declarations for DEFSYMs automatically.

[Paul Eggert]

Eli Zaretskii wrote:
> Could we instead just keep the previous semantics of XIL and XLI,
> please?  They are used in a few places outside lisp.h, so now all of
> those places need to be audited and most probably changed.  Why isn't
> it better to change the implementation of just 2 macros instead?

XIL and XLI haven't changed, and have the same semantics as before: they convert 
between Lisp_Object and EMACS_INT without altering the bits (i.e., they are 
no-ops at the machine level).  I expect it's better to keep them no-ops, for 
efficiency in the kernel of the Emacs Lisp interpreter.

I audited all the places XIL and XLI are used, and the uses in non-w32 code are 
all fine.  I don't know the w32 code, but most likely some or all of its uses 
need to be changed.  I moved the new conversion operations to lisp.h (installed 
on master) and wrote the attached untested patch for the w32 code.

0001-Fix-pointer-to-integer-conversion-in-w32-code.patch
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