Pass flags for compiling shareable objects down to APR
Add . to library search path
Make void MVM_interp_enable_tracing() public
Add some make targets - in particular 'help'
Add 'sandwich' make target
Set cygwin shell to posix
Generate .dylib on MacOS
Don't link 3rdparty libs twice when doing a shared build
Merge branch 'master' into noapr

Conflicts:
	build/Makefile.in
	build/setup.pm
Reorder headers so winsock2.h precedes windows.h