Enable proper detection of video4linux devices.

The original code detects video devices using the major/minor numbers.
On FreeBSD this does not work, so rely on the name /dev/video* instead.

Approved by: Steve Ames

devel/pwlib/files/patch-plugins-vidinput_v4l-vidinput_v4l.cxx

@@ -0,0 +1,26 @@
+--- plugins/vidinput_v4l/vidinput_v4l.cxx.orig	Wed Jan  3 23:37:37 2007
++++ plugins/vidinput_v4l/vidinput_v4l.cxx	Wed Feb  7 01:30:50 2007
+@@ -484,6 +484,15 @@
+         struct stat s;
+         if (lstat(devname, &s) == 0) {
+  
++#if defined(P_FREEBSD)
++	  // device numbers are irrelevant here, so we match on names instead.
++          if (filename.GetLength() <= 5 || filename.Left(5) != "video")
++		continue;
++	  int num = atoi(filename.Mid(6));
++	  if (num < 0 || num > 63)
++		continue;
++          vid.SetAt(num, devname);
++#else
+           static const int deviceNumbers[] = { 81 };
+           for (PINDEX i = 0; i < PARRAYSIZE(deviceNumbers); i++) {
+             if (MAJOR(s.st_rdev) == deviceNumbers[i]) {
+@@ -493,6 +502,7 @@
+               }
+             }
+           }
++#endif
+         }
+       }
+     }