Whatever we were trying to do with LLSharedLibs.cmake hasn't worked on the Mac
for a long time, and trying to fix it only digs up more problems. Skip it:
we've already worked around it.

Update the media_plugins_example CMakeLists.txt to eliminate some CMake
non-existent dependency warnings.

Reviewed at https://codereview.secondlife.com/r/167/
(The patch to create this commit was taken from there, too. That patch
was made relative to 5f0ab9443ece. Applied cleanly to the (earlier)
43b4b7927c00.)

Also fixes OPEN-36

Recent checkins introduced two different CMake macros SET_TEST_LIST (which
returned a CMake list of PATH directory strings) and SET_TEST_PATH (which
returned a single platform-appropriate PATH string). On Windows, whose
path-separator character is ';', SET_TEST_PATH interacted badly with CMake: in
CMake, a single string containing ';' characters is indistinguishable from a
list of strings.
Eliminate the return-single-string form, redirecting the name SET_TEST_PATH to
the macro that returns a CMake list. Make LL_TEST_COMMAND expect a list value,
prepending each directory string with run_build_test.py's -l switch.

Add ${SHARED_LIB_STAGING_DIR_RELEASE} to LD_LIBRARY_PATH for executing tests:
otherwise Debug-build tests can't find (e.g.) the aprutil DLL, for which we
don't build/package a debug variant.
Leverage discovery that a CMake macro can accept a target variable name
argument for LL_TEST_COMMAND macro.

Fixed mac breakage.

Using viewer_manifest.py for windows dependency deployment during build.
Added SHARED_LIBS_REL_PATH var to cmake cache.

indra/cmake/DeploySharedLibs.cmake is the script.
LLSharedLibs.cmake contains a macro to ease adding DeployShaerdLibs to a targets build.
Example usage to the mac-crash-reporter. Multiplatform and more to come soon.
Reviewed by brad.