[mythtv] Compile error with 18.1, gcc-4 on ppc

[Corrin Lakeland]

With gcc4, I get the following:

make[2]: Entering directory 
`/usr/local/src/mythtv/mythtv-0.18.1/libs/libavcodec'
gcc -c -pipe -mcpu=7400 -mtune=7400 -mpowerpc-gfxopt -maltivec -mabi=altivec 
-w -O3 -Wall -Wno-switch -maltivec -mabi=altivec -D_REENTRANT -DPIC -fPIC  
-DUSING_IVTV -DUSING_DVB -DUSING_DVB_EIT -DUSING_XRANDR -D_GNU_SOURCE 
-D_FILE_OFFSET_BITS=64 -DPREFIX=\"/usr\" -DHAVE_AV_CONFIG_H 
-D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED 
-DQT_TABLET_SUPPORT -I/usr/share/qt3/mkspecs/default -I. -I.. -I../.. 
-I../../../../../../include/qt3 -o utils.o utils.c
In file included from avcodec.h:14,
                 from utils.c:27:
common.h:63: error: array type has incomplete element type
common.h:65: error: array type has incomplete element type

This works correctly with gcc3.4

The lines in question are:

extern const struct AVOption avoptions_common[3];
extern const struct AVOption avoptions_workaround_bug[11];