Remove libm altogether.
Remove libm altogether.

It's not actually used by the examples anymore.

gcp/opusfile,gcp/opusfile,xiph/opusfile,SmartWalkieOrg/opusfile,youfearm3/opusfile,youfearm3/opusfile,SmartWalkieOrg/opusfile,xiph/opusfile,SmartWalkieOrg/opusfile,gcp/opusfile,xiph/opusfile