[bug #57071] Fix math.h and function names that block 64-bit double

[Joerg Wunsch]

Follow-up Comment #3, bug #57071 (project avr-libc):

Thanks, something "auto-configuring" like the second patch is much
appreciated.

Curious, what's the compiler switch to select 32- vs. 64-bit double? I'd like
to add a bit of documentation about the entire topic as well.

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