bug#21707: include-file cleanup for src directory

[Paul Eggert]

Eli Zaretskii wrote:
> I had compilation warnings and errors due to redisplaying_p and
> cancel_hourglass not being declared in eval.c and lread.c.  These two
> files need to include dispextern.h to avoid that problem.  (This isn't
> Windows specific, so I wonder how it compiled for you.)

It's a problem with platform-specific inclusions: xterm.h includes dispextern.h, 
but eval.c and lread.c don't include xterm.h on MS-Windows. I attempted to 
detect this sort of thing by hand without actually building on MS-Windows, but 
it's an easy thing to get wrong. Revised patch attached. Quite possibly there 
will be similar issues on other platforms, but they should be easy to fix once 
encountered.

0001-Include-file-cleanup-for-src-directory.txt
Description: Text document