Merge remote-tracking branch 'qatar/master'

* qatar/master:
  libspeexenc: add supported sample rates and channel layouts.
  Replace usleep() calls with av_usleep()
  lavu: add av_usleep() function
  utvideo: mark interlaced frames as such
  utvideo: Fix interlaced prediction for RGB utvideo.
  cosmetics: do not use full path for local headers
  lavu/file: include unistd.h only when available
  configure: check for unistd.h
  log: include unistd.h only when needed
  lavf: include libavutil/time.h instead of redeclaring av_gettime()

Conflicts:
	configure
	doc/APIchanges
	ffmpeg.c
	ffplay.c
	libavcodec/utvideo.c
	libavutil/avutil.h

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

libavformat/rtmphttp.c

@@ -24,11 +24,10 @@
  * RTMP HTTP protocol
  */
 
-#include <unistd.h>
-
 #include "libavutil/avstring.h"
 #include "libavutil/intfloat.h"
 #include "libavutil/opt.h"
+#include "libavutil/time.h"
 #include "internal.h"
 #include "http.h"
 
@@ -126,7 +125,7 @@ static int rtmp_http_read(URLContext *h, uint8_t *buf, int size)
                 if (rt->nb_bytes_read == 0) {
                     /* Wait 50ms before retrying to read a server reply in
                      * order to reduce the number of idle requets. */
-                    usleep(50000);
+                    av_usleep(50000);
                 }
 
                 if ((ret = rtmp_http_write(h, "", 1)) < 0)