MAINT: Fix tests failures on travis CI merge.
MAINT: Fix tests failures on travis CI merge.

Disable "-Wsign-compare" and "-Wunused-result" gcc warnings.
These seem to have been enabled by default recently for wheels
sdist builds.

madphysicist/numpy,Eric89GXL/numpy,mhvk/numpy,rgommers/numpy,WarrenWeckesser/numpy,madphysicist/numpy,ahaldane/numpy,shoyer/numpy,pbrod/numpy,ahaldane/numpy,pdebuyl/numpy,anntzer/numpy,mhvk/numpy,shoyer/numpy,simongibbons/numpy,jorisvandenbossche/numpy,numpy/numpy,seberg/numpy,mhvk/numpy,rgommers/numpy,charris/numpy,shoyer/numpy,anntzer/numpy,numpy/numpy,anntzer/numpy,numpy/numpy,jakirkham/numpy,ahaldane/numpy,charris/numpy,jakirkham/numpy,jakirkham/numpy,tynn/numpy,Eric89GXL/numpy,numpy/numpy,ahaldane/numpy,jakirkham/numpy,grlee77/numpy,madphysicist/numpy,ahaldane/numpy,pbrod/numpy,mhvk/numpy,pizzathief/numpy,MSeifert04/numpy,mattip/numpy,simongibbons/numpy,pizzathief/numpy,grlee77/numpy,mhvk/numpy,rgommers/numpy,WarrenWeckesser/numpy,grlee77/numpy,simongibbons/numpy,shoyer/numpy,WarrenWeckesser/numpy,tynn/numpy,Eric89GXL/numpy,pizzathief/numpy,charris/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,simongibbons/numpy,seberg/numpy,simongibbons/numpy,MSeifert04/numpy,endolith/numpy,pizzathief/numpy,WarrenWeckesser/numpy,jorisvandenbossche/numpy,gfyoung/numpy,shoyer/numpy,anntzer/numpy,pbrod/numpy,mattip/numpy,gfyoung/numpy,pbrod/numpy,endolith/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,seberg/numpy,madphysicist/numpy,endolith/numpy,pbrod/numpy,madphysicist/numpy,jakirkham/numpy,mattip/numpy,Eric89GXL/numpy,pdebuyl/numpy,endolith/numpy,abalkin/numpy,pdebuyl/numpy,mattip/numpy,pizzathief/numpy,pdebuyl/numpy,abalkin/numpy,jorisvandenbossche/numpy,seberg/numpy,gfyoung/numpy,tynn/numpy,charris/numpy,WarrenWeckesser/numpy,MSeifert04/numpy,grlee77/numpy,rgommers/numpy,grlee77/numpy,abalkin/numpy