Adjust tolerance in sinc() test for osx.
Adjust tolerance in sinc() test for osx.

OSX fails with a 2ULP error between numpy and numba.
This slackens the tolerance.

seibert/numba,jriehl/numba,gmarkall/numba,stonebig/numba,IntelLabs/numba,numba/numba,sklam/numba,pombredanne/numba,numba/numba,IntelLabs/numba,IntelLabs/numba,stuartarchibald/numba,pombredanne/numba,jriehl/numba,pombredanne/numba,stuartarchibald/numba,jriehl/numba,sklam/numba,gmarkall/numba,seibert/numba,stonebig/numba,cpcloud/numba,numba/numba,seibert/numba,gmarkall/numba,stefanseefeld/numba,sklam/numba,stuartarchibald/numba,jriehl/numba,stonebig/numba,seibert/numba,numba/numba,stefanseefeld/numba,IntelLabs/numba,gmarkall/numba,sklam/numba,pombredanne/numba,stuartarchibald/numba,jriehl/numba,numba/numba,cpcloud/numba,stefanseefeld/numba,stefanseefeld/numba,stonebig/numba,cpcloud/numba,stuartarchibald/numba,cpcloud/numba,cpcloud/numba,pombredanne/numba,IntelLabs/numba,stonebig/numba,sklam/numba,seibert/numba,stefanseefeld/numba,gmarkall/numba