Use correct name of the libdvdcss shared library on OpenBSD.
1c031048907b72c4757926a06f2bc5fac42fba15

Index: src/dvd_input.c
--- src/dvd_input.c.orig
+++ src/dvd_input.c
@@ -346,6 +346,8 @@ int dvdinput_setup(void *priv, dvd_logger_cb *logcb)
   #define CSS_LIB "libdvdcss-2.dll"
 #elif defined(__OS2__)
   #define CSS_LIB "dvdcss2.dll"
+#elif defined(__OpenBSD__)
+  #define CSS_LIB "libdvdcss.so"
 #else
   #define CSS_LIB "libdvdcss.so.2"
 #endif
