[PATCH 21.5] Fix g++ build of lwlib-Xaw.c

APPROVE

xemacs-beta deleted from addresses.

Jerry James writes:
 > PATCH 21.5
 > 
 > On Tue, Jan 6, 2015 at 9:19 AM, Marcus <[email protected]> wrote:
 > > Jerry James <[email protected]> writes:
 > >
 > >> Does the compile succeed if you cast to long first, then to int?
 > >
 > > Indeed, it does. The secrets of "why" are part of the C++ standard, I
 > > reckon. I am not even getting a warning despite the fact that casting
 > > long to int is lossy.
 > 
 > Stephen already explained the whys and wherefores, so I'll just paste
 > the patch in here for public consideration.

Obviously I'm +1 on the patch in theory, and building works for my
standard build with Apple clang (C++ *and* C) on Yosemite.

Note that Clang complains that building C code with a C++ compiler is
a "deprecated behavior".  Has anybody heard about this?  Are there
changes in the offing that will make C code that is acceptable to a
C++ compiler unusably restricted?

Steve