This patch should help to support running local INDI servers for GPhoto...

This patch should help to support running local INDI servers for GPhoto cameras on OS X.  It adds two environment variables, CAMLIBS and IOLIBS with the paths to the appropriate places in the plugins folder where I will be putting the files using our build script.  Note that I added the environment variables with a check to see whether the plugins folders in question actually exist and a check to see if it should be using the internal drivers.