configure: support Bitrig OS

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

diff --git a/configure b/configure
index 8cd5467..221dfd0 100755 (executable)
--- a/configure
+++ b/configure
@@ -2702,7 +2702,7 @@ case $target_os in
         oss_indev_extralibs="-lossaudio"
         oss_outdev_extralibs="-lossaudio"
         ;;
-    openbsd)
+    openbsd|bitrig)
         # On OpenBSD 4.5. the compiler does not use PIC unless
         # explicitly using -fPIC. FFmpeg builds fine without PIC,
         # however the generated executable will not do anything