Incorrect shared library target path computation in Windows

In CMake, the .dll part of libraries of type SHARED's target path is derived from RUNTIME_OUTPUT_DIRECTORY for DLL-platforms. Currently, in exposed utils function "DynamoRIO_get_full_path" we are incorrectly assuming all platforms are using LIBRARY_OUTPUT_DIRECTORY.

This leads to a drfuzz test failure in drmemory due to an incorrect path in .drpath file when pulling in latest DR version >= 12eed4b5