Remove the CREATE_FLAG_OPT_LEVEL_0 from the Java API.

The flag was previously used to set the optimization level
of the bcc compiler to -O0. However, this functionality is
now accomplished through deriving the optimization level
from the input bitcode. That patch can be found here:
https://android-review.googlesource.com/169330



Change-Id: I9c57d941bb35c6f737a31fcd74f31d9de25a16a8
Signed-off-by: Stephen McGroarty <stephen@codeplay.com>