[Patch] Fix ac_c99_complex configury

[Paolo Carlini]

Paolo Carlini wrote:

>I
>propose to simply use AC_TRY_LINK, here and I'm finishing regtesting the
>below.
>  
>
Actually, what I posted is too simplistic: being all those functions
builtins, the compiler is able to optimize the calls away, and no actual
functions calls are issued, anyway, even at -O0. In order to fix that I
add '-fno-builtin -lm' to the options, which actually leads to link
failures on non-C99 systems. I'm finishing testing the below (still only
two lines + reformatting)

Paolo.

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