[Patch, Fortran] PR - fix SIGNAL intrinsic (4.6/4.7 Regression)

[Tobias Burnus]

The regression seems to be a side effect of the -fwhole-file effort.

The BT_UNKNOWN of the second argument of SIGNAL(NUMBER,HANDLER) triggers 
an ICE in trans-types.c, when generating the decl for the external 
function "signal" (or rather for __gfortran_signal_func{,_int}).

As both handler == <integer expression> and handler == <subroutine 
proc-pointer> are pointers, it seems to be simplest to translate the 
second argument as "void *" (BT_VOID).

Build and regtested on x86-64-linux.
OK for the trunk and the 4.6 branch?

Tobias
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