committed: Ada updates

[Arnaud Charlet]

Tested on i686-linux
--
2004-08-16  Pascal Obry  <obry@gnat.com>

	* adaint.c (__gnat_prj_add_obj_files): Set to 0 only on Win32 for GCC
	backend prior to GCC 3.4. With GCC 3.4 we are using the GCC's shared
	option and not mdll anymore. Update comment.

2004-08-16  Pascal Obry  <obry@gnat.com>

	* bld.adb (Put_Include_Project): Properly handle directory separators
	on Windows.

2004-08-16  Ed Schonberg  <schonberg@gnat.com>

	* sem_ch4.adb (Try_Object_Operation): Restructure code. Optimize by
	decreasing the number of allocated junk nodes while searching for the
	appropriate subprogram.
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