Revert "libm: Add a proper sincos() implementation"

This reverts commit 1eb9e99.

Merge branch 'gingerbread' of git://git.omapzoom.org/platform/bionic …

…into 237

Conflicts:
	libc/Android.mk
	libthread_db/Android.mk

Change-Id: I4a730f70bf3b31331ab9cee5f1a098d4162ef4b7