Revise configure.ac

Do a little cleanup of our configure script. Highlights:

* Remove macros deemed unnecessary to call [1]
* Change check for compiler to look for one that is C99 capable-
  this automatically adds the -std=gnu99 flag

[1] Noted in the autoconf NEWS file, notably entries for 2.59d

Signed-off-by: Dan McGee <dan@archlinux.org>

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