make compilation faster on Windows

[Vincent Torri]

Hey,

by default, the header file windows.h includes a *lot* os other header
files, which are almost always useless, except in some cases of course. It
improves the compilation speed, especially with MSYS/MinGW.

There is a way to reduce the number of header files included by windows.h:

#define WIN32_LEAN_AND_MEAN
# include <windows.h>
#undef WIN32_LEAN_AND_MEAN

You can look at windows.h to see what the macro WIN32_LEAN_AND_MEAN disable.

As far as I can see, 2 files are using windows.h in gnutls/src: crypt.c and
psk.c

Maybe it is worth adding this macro in those files

regards

Vincent Torri
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