Fixed build errors originated from stlport

The STLPort in the Android repository is the latest version and there
has not been any more updates to this project. Thus, we are locally
patching STLPort to fix build errors reported by clang.
 - Introduced _STLP_UNUSED macro to fix un-used param warnings. (caused
   build errors with -Werror)

Change-Id: I67a72cad71b3c05e517d59805291b2730bd1ee7c
Author: Tareq A. Siraj <tareq.a.siraj@intel.com>
Reviewed-by: Ariel Bernal <ariel.j.bernal@intel.com>
Make it easier to use stlport correctly.

Change-Id: I55da59c8c11057b7d881301ec8c9fd4aa3bd92bf
Merge "Make it easier to use stlport correctly."
Make libstlport.mk interoperate correctly with use_rtti.mk.

Change-Id: I639d0d3dc36a0b7c2d3fb2ded42e8801daccfa7a
Merge "Make libstlport.mk interoperate correctly with use_rtti.mk."
Add std::move and std::remove_reference.

Change-Id: I75df32685446210c9eaa185785f5902a88be72a9
Merge "Add std::move and std::remove_reference."
Merge "Fixed build errors originated from stlport"
Merge https://android.googlesource.com/platform/external/stlport into jb-devel-mr2-staging

Conflicts:
	Android.mk

Change-Id: I4f7614b94c4a188e7a12d8ba60c0a24efc59d5a0