AC_CANONICAL_HOST doesn't set anything mentioning MINGW32; instead
it seems to set OSTYPE to "msys".  So accept either that or mingw32.

Add THREAD_* flags.
Rearrange CFLAGS, etc., so that it's easier to do things like
make OPT="-g" to select debugging without optimization, etc.

unfortunately linux-specific (opens /dev/fd/*).

Oh, and the new option is called --enable-threads (not --enable-pthreads).

Add possibly-misguided ThReader structure.

Try different way of detecting opengl libs in mingw32 case too.

bug, so remove the Apple-specific workaround.

Add "ready" parameter to dyndata trange method.

which seems to have bugs on some implementations (?!).
Let's see if this helps.

Add env var PARTIOLDOPENGL to force using non-glDrawElements path.

And it's been a while since 0.7 anyway.

such that texture objects need to be recreated.

If there's an 8th numeric field in a .wf file, take it to be a focallen distance.

Use Toshiyuki Takahei's FLHACKs.  Reorder functions so we don't
need quite so many of them.  Restructure msg() and warn() likewise.

Set an initial display context number so Gview can track future window changes.

if some were fixed-oriented and others screen-facing.
Portability tweak from Toshi -- be even more pessimistic about stack size.

or (new) little-endian binary.  Good for Toshi's constellation figures,
which are in little-endian binary format.