TBR: i#975 static DR: refactor STATIC_LIBRARY to a side-by-side target

Commit log for first patchset:
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i#975 static DR: refactor STATIC_LIBRARY to a side-by-side target

This is a big refactoring of the STATIC_LIBRARY top-level CMake
configuration and separate build into instead using a side-by-side
dynamorio_static target.

Removes STATIC_LIBRARY from all CMake code.  It is no longer a separate
build choice.

Adds a dynamorio_static static library build of DR that is always built.

Disables data section protection for dynamorio_static.

Adds a -static option to drrun to set the env var for auto-takeover of an
app using dynamorio_static.

Adds a new CMake utility configure_DynamoRIO_static() to make it easy to
link an app with dynamorio_static.

Renames the existing static_* tests to drdecode_* to make it clear what
they are testing.

Adds a new test static_explicit.c to test explicit use of the start/stop
API with dynamorio_static.

DR still does not look for clients without runtime options being set: that
will be added in future work.
---------------

[bruening, 2016-08-31 06:40:43]

Committed as
https://github.com/DynamoRIO/dynamorio/commit/8db618085fbe331f58709a6e5fade48...

Final commit log: 
---------------
i#975 static DR: refactor STATIC_LIBRARY to a side-by-side target

This is a big refactoring of the STATIC_LIBRARY top-level CMake
configuration and separate build into instead using a side-by-side
dynamorio_static target.

Removes STATIC_LIBRARY from all CMake code.  It is no longer a separate
build choice.

Adds a dynamorio_static static library build of DR that is always built.

Disables data section protection for dynamorio_static.

Adds a -static option to drrun to set the env var for auto-takeover of an
app using dynamorio_static.

Adds a new CMake utility configure_DynamoRIO_static() to make it easy to
link an app with dynamorio_static.

Renames the existing static_* tests to drdecode_* to make it clear what
they are testing.

Adds a new test static_explicit.c to test explicit use of the start/stop
API with dynamorio_static.

DR still does not look for clients without runtime options being set: that
will be added in future work.

Review-URL: https://codereview.appspot.com/309260043
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