Add .amr to recognized extensions

And update NEWS to show latest improvements of avcodec. Next contribs
on mac and Windows should have AMR working

NEWS

@@ -30,6 +30,7 @@ Decoders:
  * Audio/Video decoder using OpenMAX IL components
  * Support for Indeo5 video codec
  * Support for Windows Media Speech (Voice) audio codec natively on all platforms
+ * Support for AMR-NB audio codec on the Windows and Mac port
 
 Demuxers:
  * Support for ADPCM in .flv streams

include/vlc_interface.h

@@ -172,6 +172,7 @@ typedef enum vlc_dialog {
     "*.aac;" \
     "*.ac3;" \
     "*.aiff;"\
+    "*.amr;" \
     "*.aob;" \
     "*.ape;" \
     "*.dts;" \