[Patch, Fortran] Make -Wall no longer imply -Wcompare-reals

[Tobias Burnus]

Dear all,

while -Wcompare-reals is a useful option to find bugs, practical 
experience and the discussion here and on c.l.f has shown that this 
option has too many false positives. Hence, it is not suitable for -Wall.

With patch, -Wall no longer implies -Wcompare-reals.

Build on x86-64-linux.
OK for the trunk?

Tobias

PS: I will update wiki/GFortran#news after the committal.
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