configure: add missing fork() dependency to http_multiclient example

Signed-off-by: James Almer <jamrial@gmail.com>

diff --git a/configure b/configure
index 72ffaea..5993de5 100755 (executable)
--- a/configure
+++ b/configure
@@ -3119,7 +3119,7 @@ extract_mvs_example_deps="avcodec avformat avutil"
 filter_audio_example_deps="avfilter avutil"
 filtering_audio_example_deps="avfilter avcodec avformat avutil"
 filtering_video_example_deps="avfilter avcodec avformat avutil"
-http_multiclient_example_deps="avformat avutil"
+http_multiclient_example_deps="avformat avutil fork"
 metadata_example_deps="avformat avutil"
 muxing_example_deps="avcodec avformat avutil swscale"
 qsvdec_example_deps="avcodec avutil libmfx h264_qsv_decoder vaapi_x11"