libltdl implementation for Darwin
More FileManager functions (and stubs)
__darwin_chdir() now recognizes sysroot
Made CoreAudio implementation optional, use -DWITH_COREAUDIO to enable
Simplified darling library names
Added sysroot detection into dyldd
Support -h/--help in dyld and dyldd
libltdl implementation for Darwin

Conflicts:
	CMakeLists.txt
Made CoreAudio implementation optional, use -DWITH_COREAUDIO to enable

Conflicts:
	src/CoreServices/CMakeLists.txt
MachOMgr: Call realpath on the object being looked up so that it matches what they are added with.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	CMakeLists.txt
	etc/dylib.conf
	src/CoreFoundation/CMakeLists.txt
	src/CoreServices/CMakeLists.txt
	src/CoreServices/FileManager.cpp
	src/CoreServices/FileManager.h
	src/libSystem/CMakeLists.txt