fix compilation

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8779 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

tests/seek_test.c

@@ -23,6 +23,8 @@
 
 #include "avformat.h"
 
+#undef exit
+
 int main(int argc, char **argv)
 {
     const char *filename;