configure: Fix standalone compilation of the ljpeg encoder.

Also fixes compilation with --disable-error-resilience.
Fixes ticket #6060.

configure

@@ -2441,7 +2441,7 @@ jpegls_decoder_select="golomb mjpeg_decoder"
 jpegls_encoder_select="golomb"
 jv_decoder_select="blockdsp"
 lagarith_decoder_select="huffyuvdsp"
-ljpeg_encoder_select="aandcttables idctdsp jpegtables"
+ljpeg_encoder_select="aandcttables idctdsp jpegtables mpegvideoenc"
 loco_decoder_select="golomb"
 magicyuv_decoder_select="huffyuvdsp llviddsp"
 mdec_decoder_select="blockdsp idctdsp mpegvideo"