Add symbol versioning for shared libraries

Based on patch by Reinhard Tartler <siretart tauware de>

Originally committed as revision 21236 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 3 insertions, 0 deletions

diff --git a/libavcodec/libavcodec.v b/libavcodec/libavcodec.v
new file mode 100644
index 0000000000..561a42cd4f
--- /dev/null
+++ b/libavcodec/libavcodec.v
@@ -0,0 +1,3 @@
+LIBAVCODEC_$MAJOR {
+        global: *;
+};