[gomp4/stage1] Utility functions for collect2/lto-wrapper/mkoffload 2/2

[Bernd Schmidt]

This is the second part of making a set of utility functions to be used 
by collect2, lto-wrapper and mkoffload.

The implementations of some functions like fork_execute are changed to 
those from collect2 and the calls in lto-wrapper adapted accordingly. 
There are some minor changes in these functions: for example I avoid 
calling fatal_error, instead using the fatal/fatal_perror functions so 
that the cleanup routine is called properly (lto-wrapper does not use 
atexit as collect2 does).

Committed on gomp-4_0-branch; ok for stage1?


Bernd

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