Don't hardcode the valid architectures in one xcode project

There's no reason to hardcode these here - these are the default.
(We keep the intentionally hardcoded default arch in the
codec_unittest project though.)
Set the iOS deployment target consistently

Set it on the project level, don't override it on the target level.

Set the deployment target to 6.0 everywhere.
Include inherited header search paths in all projects
solve green issue combined with EC and multi-packet input
Use default paths for and object files and other intermediate files

This makes sure that one can build for all architectures without
having the intermediates from one clobber the other.
update binary comparison test script
Fix generating the version header when building outside of the source tree

Also silence this command in silent builds.
    add trace tag
Remove outdated advice from the readme

We no longer use the GCCVERSION variable - we let the NDK pick whichever
compiler version is the default for the chosen architecture.
Remove unused includes of sys/timeb.h

This header is included by crt_util_safe_x.h whenever necessary (it's
all hidden in the SWelsTime struct) - code which does not explicitly
use things from sys/timeb.h shouldn't include it.
Manually define the SWelsTime struct on unix, don't rely on struct timeb

We don't use the ftime function on unix for filling SWelsTime anyway,
we fill the time and millitm fields manually.

On android, the sys/timeb.h header has been removed in the next
platform version (currently available in NDK r10 in the "L preview"
release), since this header and the ftime function have been removed
from the POSIX 2008 specification.

This fixes compilation when targeting the Android "L preview" release,
even when targeting the 32 bit ABIs.
Add support for building for the new 64 bit android ABIs

This requires the new NDK r10.

The mips64 ABI is handled by the default case, there's no need to
add custom code for that in platform-android.mk.
Fix incorrect indentation in build/platform-android.mk
Merge pull request #1181 from mstorsjo/generate-version

Fix generating the version header when building outside of the source tree
Update info file for bugzilla 1037754 - no longer need to advertise VP8.
Merge pull request #1151 from mstorsjo/unify-deployment-target

Set the iOS deployment target consistently
Merge pull request #1180 from huili2/dpb_green_issue_master

solve green issue combined with EC and multi-packet input
Merge pull request #1152 from mstorsjo/xcode-inherit-include-paths

Include inherited header search paths in all projects
Merge pull request #1171 from shihuade/ReleaseV2.2

update binary comparison test script
modify the logic for WME usage