missing port depency for "libquicktime"

[cduvivier@…]

The "libquicktime" port depends on the "xorg-libXv" port but that dependency is not expressed in its Portfile.

Adding "port:xorg-libXv" at the end of line 19 solves the issue.

Although I didn't explicitly try, I suspect it also depends on other xorg packages like xorg-libXau, ... (see all the library linked in the failing link line when reproducing with below commands)

To reproduce:
sudo port uninstall --follow-dependents xorg-libXv
sudo port uninstall --follow-dependents libquicktime
sudo port install libquicktime
...
ld: library not found for -lXv
collect2: ld returned 1 exit status
...

[mww@…]

thanks, commited!