Fix syntax of HAVE_STAT_TV_NSEC2 and HAVE_SOCKADDR_SA_LEN checks
Fix syntax of HAVE_STAT_TV_NSEC2 and HAVE_SOCKADDR_SA_LEN checks

The problem has been detected on MacOSX while comparing the pyconfig.h
configured by regular python build system and the CMake based
build system.

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