[Ada] Code clean up (remove unused code)

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-linux, committed on trunk.

On some targets (specifically VMS), we used to configure gcc with
--enable-threads=gnat, which needed corresponding functions in the GNAT
run-time. This need is now removed, since --enable-threads=posix (and
weak symbols) can now be used instead.

This change will also allow us to get rid of the
--enable-threads=gnat code in the configure file.

2005-11-14  Arnaud Charlet  <charlet@adacore.com>

	* adaint.h, adaint.c (__gnat_is_cross_compiler): New constant.
	(Gnat_Install_Locks, __gnatlib_install_locks): Removed, no longer used.
	(convert_address): Update comments and list of platforms using this.

	* s-tasini.adb (Gnat_Install_Locks, __gnatlib_install_locks): Removed,
	no longer used.

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