MAINT: Declare functions `static` rather than `NPY_NO_EXPORT`
MAINT: Declare functions `static` rather than `NPY_NO_EXPORT`

These functions do not require `NPY_NO_EXPORT`. One of them was
(incorrectly) flagged by code coverage. Maybe this helps...

pbrod/numpy,mattip/numpy,simongibbons/numpy,mhvk/numpy,mattip/numpy,simongibbons/numpy,anntzer/numpy,mhvk/numpy,rgommers/numpy,seberg/numpy,charris/numpy,rgommers/numpy,pdebuyl/numpy,simongibbons/numpy,anntzer/numpy,jakirkham/numpy,mhvk/numpy,numpy/numpy,endolith/numpy,endolith/numpy,jakirkham/numpy,pdebuyl/numpy,rgommers/numpy,numpy/numpy,numpy/numpy,charris/numpy,mhvk/numpy,mattip/numpy,jakirkham/numpy,numpy/numpy,anntzer/numpy,charris/numpy,pbrod/numpy,jakirkham/numpy,endolith/numpy,endolith/numpy,mattip/numpy,simongibbons/numpy,pbrod/numpy,pdebuyl/numpy,pbrod/numpy,jakirkham/numpy,anntzer/numpy,mhvk/numpy,pdebuyl/numpy,pbrod/numpy,rgommers/numpy,seberg/numpy,seberg/numpy,simongibbons/numpy,seberg/numpy,charris/numpy