[Ada] Remove duplicated code in win32 run-time

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-mingw, committed on trunk

This work aims at having a common unit to share all the
Win32 import routines. Most of them where either in
s-osinte-mingw.ads which was a tasking unit not to be withed
from the non-tasking part of the runtime or directly declared
into bodies and sometimes duplicated from s-osinte-mingw.ads.
This work is then mostly code refactoring.

2008-04-08  Pascal Obry  <obry@adacore.com>

	* a-exetim-mingw.adb, s-gloloc-mingw.adb, s-taprop-mingw.adb,
	s-tasinf-mingw.ad{s,b}, s-taspri-mingw.ads:
	Use new s-win32.ads unit instead of declaration
	from s-osinte-mingw.ads.
	
	* s-osinte-mingw.ads:
	Move all non tasking based interface to s-win32.ads.
	
	* s-osprim-mingw.adb:
	Remove duplicated declarations and use s-win32.ads
	unit instead.

	* s-win32.ads, s-winext.ads: New files.

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