[Ada] darwin fix wrt -static/shared-libgcc

[Arnaud Charlet <charlet at adacore dot com>]

Manually tested on darwin.
Tested on i686-linux, committed on trunk.

On darwin, -shared-libgcc or -static-libgcc must be explicitly provided
at link time with GCC 4 for any program to work. This fix makes sure
that if -shared-libgcc is not used to link, -static-libgcc is used.

2006-10-31  Vincent Celier  <celier@adacore.com>

	* gnatlink.adb (Gnatlink): If gcc is not called with -shared-libgcc,
	call it with -static-libgcc, as there are some platforms, such as
	Darwin, where one of these two switches is compulsory to link.

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