Add individual watch files for NX components in this source package.

debian/watch.nx-X11

+version=3
+http://www.nomachine.com/sources.php \
+  http://[^"]*/nx-X11-([\d\.-]*)\.tar\.gz

debian/watch.nxagent

+version=3
+http://www.nomachine.com/sources.php \
+  http://[^"]*/nxagent-([\d\.-]*)\.tar\.gz

debian/watch.nxauth

+version=3
+http://www.nomachine.com/sources.php \
+  http://[^"]*/nxauth-([\d\.-]*)\.tar\.gz

debian/watch.nxcomp

+version=3
+http://www.nomachine.com/sources.php \
+  http://[^"]*/nxcomp-([\d\.-]*)\.tar\.gz

debian/watch.nxcompext

+version=3
+http://www.nomachine.com/sources.php \
+  http://[^"]*/nxcompext-([\d\.-]*)\.tar\.gz

debian/watch.nxcompshad

+version=3
+http://www.nomachine.com/sources.php \
+  http://[^"]*/nxcompshad-([\d\.-]*)\.tar\.gz

debian/watch.nxproxy

+version=3
+http://www.nomachine.com/sources.php \
+  http://[^"]*/nxproxy-([\d\.-]*)\.tar\.gz