[libgfortran,commited] Correct cabs and conjg specifics

[FX Coudert]

Commited the attached patch to 4.2 after regtesting on x86_64-linux.  
This corrects cabs when used as an argument (the __specific_abs_c?*  
functions from libgfortran), which returned incorrect result. Also  
change the library names for __specific_conjg_c* into  
__specific_conjg_*, since this is what the front-end calls.

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