Fix 'make install' on OS X
Fix 'make install' on OS X

We decompose 'install -D' into 'mkdir -p' and 'install'

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@citrix.com>

thomassa/vhd-tool,djs55/vhd-tool,euanh/vhd-tool,euanh/vhd-tool,djs55/vhd-tool