BLD: use NPY_RELAXED_STRIDES_CHECKING for one TravisCI configuration
BLD: for the relaxed strides TravisCI build force a specific numpy version, and also spam more numpy settings to the build log
BLD: try forcing numpy rebuild with relaxed strides on TravisCI
Merge pull request #4226 from ev-br/pr/4224

MAINT: force the numpy rebuild with relaxed strides in Travis-CI