[v3] tweak -ffunction-sections configure test

[Benjamin Kosnik]

This adds -g to the compile line when testing -ffunction-sections, in 
the hopes that the results will be more accurate on AIX and cygwin, and 
reflect actual usage.

In addition, I fixed up the breakage caused when I added the function 
definition to the test code to be compiled.

tested x86/linux

-benjamin
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