bunch of small thing patch by (Roman Shaposhnick <rvs at sun dot com>)

Originally committed as revision 1753 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -45,6 +45,9 @@ case "$cpu" in
   mips)
     cpu="mips"
   ;;
+  sun4u)
+    cpu="sparc64"
+  ;;
   *)
     cpu="unknown"
   ;;

ffserver.c

@@ -3823,8 +3823,11 @@ static int parse_ffconfig(const char *filename)
                     if (!argbuf[0])
                         break;
 
-                    feed->child_argv[i] = av_malloc(strlen(argbuf + 1));
-                    strcpy(feed->child_argv[i], argbuf);
+                    if (strlen(argbuf + 1)) {
+		        feed->child_argv[i] = av_malloc(strlen(argbuf + 1));
+                        strcpy(feed->child_argv[i], argbuf);
+		    } else
+		        feed->child_argv[i] = NULL;
                 }
 
                 feed->child_argv[i] = av_malloc(30 + strlen(feed->filename));