* 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