avcodec/loongarch/Makefile: Fix vc1dsp_lasx.o build criterion

Fixes ticket #11057.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/loongarch/Makefile

@@ -12,7 +12,7 @@ OBJS-$(CONFIG_HEVC_DECODER)           += loongarch/hevcdsp_init_loongarch.o
 LASX-OBJS-$(CONFIG_H264QPEL)          += loongarch/h264qpel_lasx.o
 LASX-OBJS-$(CONFIG_H264DSP)           += loongarch/h264dsp_lasx.o \
                                          loongarch/h264_deblock_lasx.o
-LASX-OBJS-$(CONFIG_VC1_DECODER)       += loongarch/vc1dsp_lasx.o
+LASX-OBJS-$(CONFIG_VC1DSP)            += loongarch/vc1dsp_lasx.o
 LASX-OBJS-$(CONFIG_HPELDSP)           += loongarch/hpeldsp_lasx.o
 LASX-OBJS-$(CONFIG_IDCTDSP)           += loongarch/simple_idct_lasx.o  \
                                          loongarch/idctdsp_lasx.o