configure: remove redundant extralibs settings

Originally committed as revision 24705 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1351,13 +1351,10 @@ w64_demuxer_deps="wav_demuxer"
 
 # indevs / outdevs
 alsa_indev_deps="alsa_asoundlib_h snd_pcm_htimestamp"
-alsa_indev_extralibs="-lasound"
 alsa_outdev_deps="alsa_asoundlib_h"
-alsa_outdev_extralibs="-lasound"
 bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
 dv1394_indev_deps="dv1394 dv_demuxer"
 jack_indev_deps="jack_jack_h"
-jack_indev_extralibs="-ljack"
 libdc1394_indev_deps="libdc1394"
 oss_indev_deps_any="soundcard_h sys_soundcard_h"
 oss_outdev_deps_any="soundcard_h sys_soundcard_h"