tree 4507a57c91ef4598511ab43167c8771f84b0fd87
parent 20b45958c39d836cce95d88c09b869d1e0ba921c
author Elliott Hughes <enh@google.com> 1581439589 -0800
committer Elliott Hughes <enh@google.com> 1581439589 -0800

Clean up the math headers.

I had hoped that this would then let us remove more of the "introduced
in" annotations, but it looks like that's not really going to happen
until the NDK's minimum supported API is 21.

Also remove a .c file that wasn't referenced anywhere.

Test: treehugger
Change-Id: I8b4a61c082293f8445195a4fa5ee30595d70444e