build sys: enable the decoding_encoding example under the ffmpeg/doc/examples

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -2592,6 +2592,7 @@ zoompan_filter_deps="swscale"
 # examples
 avio_reading="avformat avcodec avutil"
 avcodec_example_deps="avcodec avutil"
+decoding_encoding_example_deps="avcodec avformat avutil"
 demuxing_decoding_example_deps="avcodec avformat avutil"
 extract_mvs_example_deps="avcodec avformat avutil"
 filter_audio_example_deps="avfilter avutil"

doc/Makefile

@@ -38,6 +38,7 @@ DOCS = $(DOCS-yes)
 
 DOC_EXAMPLES-$(CONFIG_AVIO_READING_EXAMPLE)      += avio_reading
 DOC_EXAMPLES-$(CONFIG_AVCODEC_EXAMPLE)           += avcodec
+DOC_EXAMPLES-$(CONFIG_DECODING_ENCODING_EXAMPLE) += decoding_encoding
 DOC_EXAMPLES-$(CONFIG_DEMUXING_DECODING_EXAMPLE) += demuxing_decoding
 DOC_EXAMPLES-$(CONFIG_EXTRACT_MVS_EXAMPLE)       += extract_mvs
 DOC_EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE)      += filter_audio