BLD: fix compilation on non glibc-Linuxes
BLD: fix compilation on non glibc-Linuxes

Non-glibc Linuxes dont have the __GLIBC_PREREQ function and compilation of numpy
fails on such platforms. To avoid this the TRIG_OK check should be done only in
the glibc environment

The patch is taken from AlpineLinux repository
http://git.alpinelinux.org/cgit/aports/tree/testing/py-numpy/numpy-1.10.0-musl.patch?id=2e5c4bfcf1c9746edd58a8e684d01403f234e71d

mhvk/numpy,mhvk/numpy,argriffing/numpy,ahaldane/numpy,AustereCuriosity/numpy,jakirkham/numpy,njase/numpy,tacaswell/numpy,joferkington/numpy,ahaldane/numpy,stuarteberg/numpy,njase/numpy,MSeifert04/numpy,grlee77/numpy,rherault-insa/numpy,mattip/numpy,madphysicist/numpy,drasmuss/numpy,nbeaver/numpy,anntzer/numpy,behzadnouri/numpy,gmcastil/numpy,bertrand-l/numpy,solarjoe/numpy,seberg/numpy,numpy/numpy,charris/numpy,grlee77/numpy,AustereCuriosity/numpy,kiwifb/numpy,Eric89GXL/numpy,skwbc/numpy,seberg/numpy,tynn/numpy,bertrand-l/numpy,b-carter/numpy,joferkington/numpy,bringingheavendown/numpy,Eric89GXL/numpy,rherault-insa/numpy,simongibbons/numpy,charris/numpy,simongibbons/numpy,tynn/numpy,dwillmer/numpy,simongibbons/numpy,gfyoung/numpy,WarrenWeckesser/numpy,abalkin/numpy,pbrod/numpy,jakirkham/numpy,pdebuyl/numpy,dwillmer/numpy,bringingheavendown/numpy,MSeifert04/numpy,gfyoung/numpy,grlee77/numpy,WarrenWeckesser/numpy,pizzathief/numpy,tacaswell/numpy,kiwifb/numpy,skwbc/numpy,shoyer/numpy,maniteja123/numpy,simongibbons/numpy,SiccarPoint/numpy,numpy/numpy,utke1/numpy,ContinuumIO/numpy,madphysicist/numpy,anntzer/numpy,mattip/numpy,ssanderson/numpy,solarjoe/numpy,b-carter/numpy,ahaldane/numpy,utke1/numpy,njase/numpy,maniteja123/numpy,AustereCuriosity/numpy,endolith/numpy,bringingheavendown/numpy,ddasilva/numpy,SiccarPoint/numpy,chatcannon/numpy,madphysicist/numpy,ddasilva/numpy,stuarteberg/numpy,joferkington/numpy,jorisvandenbossche/numpy,charris/numpy,joferkington/numpy,grlee77/numpy,mhvk/numpy,solarjoe/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,ContinuumIO/numpy,jakirkham/numpy,drasmuss/numpy,SiccarPoint/numpy,chatcannon/numpy,pdebuyl/numpy,numpy/numpy,WarrenWeckesser/numpy,ContinuumIO/numpy,rgommers/numpy,rgommers/numpy,pizzathief/numpy,pizzathief/numpy,chatcannon/numpy,anntzer/numpy,stuarteberg/numpy,ddasilva/numpy,MSeifert04/numpy,kiwifb/numpy,chiffa/numpy,numpy/numpy,endolith/numpy,b-carter/numpy,grlee77/numpy,gmcastil/numpy,seberg/numpy,shoyer/numpy,jorisvandenbossche/numpy,ahaldane/numpy,argriffing/numpy,abalkin/numpy,skwbc/numpy,WarrenWeckesser/numpy,pbrod/numpy,pdebuyl/numpy,drasmuss/numpy,endolith/numpy,mattip/numpy,gfyoung/numpy,abalkin/numpy,jakirkham/numpy,behzadnouri/numpy,madphysicist/numpy,rgommers/numpy,mattip/numpy,endolith/numpy,pizzathief/numpy,ssanderson/numpy,utke1/numpy,argriffing/numpy,pbrod/numpy,chiffa/numpy,rherault-insa/numpy,mhvk/numpy,shoyer/numpy,maniteja123/numpy,SiccarPoint/numpy,dwillmer/numpy,stuarteberg/numpy,rgommers/numpy,ssanderson/numpy,madphysicist/numpy,bertrand-l/numpy,ahaldane/numpy,jakirkham/numpy,mhvk/numpy,shoyer/numpy,pdebuyl/numpy,jorisvandenbossche/numpy,Eric89GXL/numpy,Eric89GXL/numpy,charris/numpy,pbrod/numpy,nbeaver/numpy,WarrenWeckesser/numpy,behzadnouri/numpy,MSeifert04/numpy,anntzer/numpy,tynn/numpy,jorisvandenbossche/numpy,tacaswell/numpy,simongibbons/numpy,chiffa/numpy,nbeaver/numpy,shoyer/numpy,pbrod/numpy,seberg/numpy,dwillmer/numpy,gmcastil/numpy,pizzathief/numpy