TBR: i#1923, DRi#2127, DRi#1374: eliminate UNIX symlink library versioning

Commit log for first patchset:
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i#1923, DRi#2127, DRi#1374: eliminate UNIX symlink library versioning

Eliminates libdynamorio.so versioning on UNIX platforms to avoid numerous
problems (DRi#2127: hardcoded DT_NEEDED, DRi#1374: similar issues on Mac,
Android symlink limitations).  These versions were not providing much
benefit, as we weren't using the system loader.  DR's loader and the DRMF
init code provide their own client version compatibility checks.

Updates DR to 549ce61 for the same sorts of changes in the DR code as well
as a fix for DRi#2128.
Updates test asm line numbers for asm define changes.
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[bruening, 2017-01-10 02:47:52]

Committed as
https://github.com/DynamoRIO/drmemory/commit/2ee98e8a48e8927c737b97a3e1480a20...

Final commit log: 
---------------
i#1923, DRi#2127, DRi#1374: eliminate UNIX symlink library versioning

Eliminates libdynamorio.so versioning on UNIX platforms to avoid numerous
problems (DRi#2127: hardcoded DT_NEEDED, DRi#1374: similar issues on Mac,
Android symlink limitations).  These versions were not providing much
benefit, as we weren't using the system loader.  DR's loader and the DRMF
init code provide their own client version compatibility checks.

Updates DR to 549ce61 for the same sorts of changes in the DR code as well
as a fix for DRi#2128.
Updates test asm line numbers for asm define changes.

Review-URL: https://codereview.appspot.com/311500043
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