[Mesa-dev] broken tinderbox - AC_CHECK_FUNC nested in AC_CHECK_DECLS for signbit

[Dave Airlie]

Hi guys,

Tinderbox is red due to mesa failing to build, investigating seems to
be the signbit change.

The nesting of the AC_CHECK_FUNC inside the AC_CHECK_DECLS seems to
defeat autoconf 2.63 that we ship in RHEL6.

removing the nesting lets it configure here, but hopefully someone has
a nicer idea.

Dave.