* com.c (ffecom_init_0): Define built-in functions for atan2,
exp, floor, fmod, log and pow.
(duplicate_decls): Preserve assembler name when redeclaring a
built-in.
* com-rt.def: Implement using the built-in forms of the above
functions rather than calling the standard C library directly.
Correct some of the run-time prototype "codes".
From-SVN: r66714
