[gfortran] add SIGNAL and ALARM intrinsics

[FX Coudert]

:ADDPATCH fortran:

>> Attached patch adds the SIGNAL and ALARM intrinsics to gfortran, that 
>> were available in g77 and all commercial compilers (and used in lots of 
>> scientific code, for handling "out of allocated CPU time" signals).
>>
>> Built, tested and regtested on i686-linux.
>>
>> OK for mainline and 4.0?

All the errors noted by Steve were corrected, and the library functions 
interface was reworked (using only "C int" integers).

Built and tested again on i686-linux. OK for mainline and 4.0?

FX

PS: attached are three fortran programs and a C subroutine (handlers.c, 
a1.f, a2.f, signal.f) that will help the reviewer play with these new 
intrinsics if he wants to...
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