Fix wmv1 encoding if all other msmpeg4-related encoders were disabled.

libavcodec/Makefile

@@ -508,6 +508,7 @@ OBJS-$(CONFIG_WMAVOICE_DECODER)        += wmavoice.o \
                                           celp_filters.o \
                                           acelp_vectors.o acelp_filters.o
 OBJS-$(CONFIG_WMV1_DECODER)            += msmpeg4dec.o msmpeg4.o msmpeg4data.o
+OBJS-$(CONFIG_WMV1_ENCODER)            += msmpeg4enc.o
 OBJS-$(CONFIG_WMV2_DECODER)            += wmv2dec.o wmv2.o wmv2dsp.o \
                                           msmpeg4dec.o msmpeg4.o msmpeg4data.o
 OBJS-$(CONFIG_WMV2_ENCODER)            += wmv2enc.o wmv2.o wmv2dsp.o \

libavcodec/msmpeg4.h

@@ -64,6 +64,7 @@ int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64]);
                                 CONFIG_VC1_DECODER)
 #define CONFIG_MSMPEG4_ENCODER (CONFIG_MSMPEG4V2_ENCODER || \
                                 CONFIG_MSMPEG4V3_ENCODER || \
+                                CONFIG_WMV1_ENCODER      || \
                                 CONFIG_WMV2_ENCODER)
 
 #endif /* AVCODEC_MSMPEG4_H */