Revert "Fix and suppress warnings in external/libspeex."

This reverts commit 201a22f03f2757a0fb4c1d89f91d007d84fb2edd.

Bug: http://b/77299793
Test: builds (this revert manually tested by bug submitter)
Change-Id: Ide43003bd82dddb4a37ef09d9781e3778701a490
2 files changed