Add clog10 to builtins.def, round 2

[FX Coudert]

> The fortran front-end needs to recognize clog10, clog10f and clog10l a
> proper built-ins. Attached patch tries to add them to clog10, under a
> new category: DEF_EXT_C99RES_BUILTIN (as suggested by jsm28).
> 
> Can someone review this? Is it OK?

Just realized I forgot the ChangeLog entry to go with it.

OK to commit?
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