remove pause frame interface which will be done in application level
expand pic for EC
version-generate
enable hashcode verification for screen content
Support building outside of the source tree

This allows building two versions for different architectures at
the same time, without the built files clobbering each other.

This is very helpful when trying to track down differences between
two build configurations.

To build outside of the source tree, create the other directory to
use for building (either outside of the openh264 directory, or as
a subdirectory), enter that directory, and do
"make -f path/to/openh264/Makefile".
Merge pull request #1141 from mstorsjo/outoftree

Support building outside of the source tree
Merge pull request #1174 from huili2/border_green_master

expand pic for EC
Merge pull request #1177 from huili2/version_all

version-generate
Merge pull request #1172 from ruil2/pause_remove

    remove pause frame interface which will be done in application level
Merge pull request #1175 from ruil2/scc_ut

enable hashcode verification for screen content