[libgfortran,patch] C99 complex cleanup

[FX Coudert]

Attached patch change the way we implement C99 complex fallback 
functions, removing them from the generated files and adding them to 
c99_functions.c. I took this opportunity to add macro definitions such as:

#ifndef HAVE_FOO
#define HAVE_FOO
extern double foo (double)
#endif

so that we can rely on the HAVE_FOO macros even for fallback functions 
(this was not the case before).

Bootstrapped and regtested on i686-linux and i386-freebsd.
OK for mainline, and 4.0 when it reopens?

FX
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