GVFS 1.16.1 Fixes Compiler Warnings and Other Issues

GVFS 1.16.1 fixes a daemon issue, ensuring that file monitors are no longer prematurely finalized; fixes a crash in the obexftp function, which appeared due to missing D-Bus threads support; and fixes compiler warning. The app also fixes three bugs found in the gvfschannel function: a readahead behavior fix, a daemon crash fix, which appeared when cancelling channel operations, and a proper error is shown if no more free fds exists.