New upstream release.
This update also fixes the build on FreeBSD 9.3-RELEASE. At least there, it appears the definition of powl(3) is hidden behind _DECLARE_C99_LDBL_MATH. This is fixed in at least 11-CURRENT; I didn't check in FreeBSD 10.x. Let's fix the build by defining _DECLARE_C99_LDBL_MATH, as it is done in a few other ports already.