Add "#cmakedefine" to pyconfig.h.in erroneously omitted.
Add "#cmakedefine" to pyconfig.h.in erroneously omitted.

In 9baa8f2fc, the #cmakedefine associated with "acosh", "isfinite", "isinf",
"isnan", "tgamma" and "tanh_preserves_zero_sign" have been omitted.
This commit fixes it.

thewtex/python-cmake-buildsystem,jcfr/python-cmake-buildsystem,thewtex/python-cmake-buildsystem,msmolens/python-cmake-buildsystem,adrianbroher/python-cmake-buildsystem,davidsansome/python-cmake-buildsystem,python-cmake-buildsystem/python-cmake-buildsystem,chuckatkins/python-cmake-buildsystem