Fix in ezpc.sh: add ezpc signed library file only when codegen is either unspecified or specified as ABY or CPP. Plus, diff of precompiled output used to differ because of an earlier change: updated all the precompiled output files.

Fix for input output in other functions giving error when compiled wi…

Fix for input output in other functions giving error when compiled with ABY: made a global variable named role and assigned the same in main.

Updated ezpc.h for logical and arithmetic right shifts: arithmetic right shift now uses logical as subroutine; logical was earlier not padding the output shares correctly - fixed that.

Merging changes for ezpc from internal repo.

BUG DESCRIPTION: Arithmetic right shift used to lead to segfaults when used with ABY.
FIX: - Updated function arithmetic_right_shift in file ABY_example/common/ezpc.h
     - Adding correct gate ids before feeding the new share value to create a share.

More specifically, some of these changes include:
- Added extern function support to ezpc.
- Added SecureNN as backend to ezpc.
- More bug fixes.
- All test_suite examples' precompiled-output are updated with new compiler changes.
- Added an updated and more complex sample compiled test file in ABY_example.

Tests done
- "make runtest" works fine for all test_suite examples.
- Sample code in ABY_example is also tested to be working with latest ABY.