We now have no remaining things in header files that switch from being
a declaration to a definition depending on an awkward #define at the
point of including that header. There are still a few mutable
variables with external linkage, but at least now each one is defined
in a specific source file file appropriate to its purpose and context.
The remaining globals as of this commit were:
- 'logctx' and 'term', which never needed to be globals in the first
place, because they were never actually shared between source
files. Now 'term' is just a static in window.c, and 'logctx' is a
static in each of that and winplink.c.
- 'hinst', which still has external linkage, but is now defined
separately in each source file that sets it up (i.e. those with a
WinMain)
- osMajorVersion, osMinorVersion and osPlatformId, whose definitions
now live in winmisc.c alongside the code which sets them up.
(Actually they were defined there all along, it turns out, but
every toolchain I've built with has commoned them together with the
version defined by the GLOBAL in the header.)
- 'hwnd', which nothing was actually _using_ any more after previous
commits, so all this commit had to do was delete it.
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