Orc 0.4.30 has a bug that causes duplicate symbols due to a missing typedef.

Taken from upstream:
https://gitlab.freedesktop.org/gstreamer/orc/merge_requests/32

diff --git a/orc/orctarget.h b/orc/orctarget.h
--- a/orc/orctarget.h
+++ b/orc/orctarget.h
@@ -19,7 +19,7 @@ enum {
   ORC_TARGET_FAST_DENORMAL = (1<<31)
 };
 
-enum {
+typedef enum {
   ORC_TARGET_POWERPC_64BIT = (1<<0),
   ORC_TARGET_POWERPC_LE = (1<<1),
   ORC_TARGET_POWERPC_ALTIVEC = (1<<2),