Merge "changed configure option name to reduce confusion"

diff --cc configure
Simple merge

diff --cc vp8/common/generic/systemdependent.c
Simple merge

diff --cc vp8/encoder/generic/csystemdependent.c
Simple merge

diff --cc vp8/encoder/onyx_if.c
Simple merge

diff --cc vp8/encoder/onyx_int.h
Simple merge

diff --cc vp8/encoder/x86/x86_csystemdependent.c
Simple merge