rearrange --help text slightly

Originally committed as revision 8010 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -68,14 +68,18 @@ show_help(){
   echo "  --disable-static         do not build static libraries [default=no]"
   echo "  --enable-shared          build shared libraries [default=no]"
   echo "  --disable-shared         do not build shared libraries [default=yes]"
+  echo "  --enable-gpl             allow use of GPL code, the resulting libav*"
+  echo "                           and ffmpeg will be under GPL [default=no]"
   echo "  --enable-pp              enable GPLed postprocessing support [default=no]"
   echo "  --enable-swscaler        software scaler support [default=no]"
-  echo "  --enable-sunmlib         use Sun medialib [default=no]"
   echo "  --enable-beosthreads     use BeOS threads [default=no]"
   echo "  --enable-os2threads      use OS/2 threads [default=no]"
   echo "  --enable-pthreads        use pthreads [default=no]"
   echo "  --enable-w32threads      use Win32 threads [default=no]"
   echo "  --enable-x11grab         enable X11 grabbing [default=no]"
+  echo
+  echo "External library support:"
+  echo "  --enable-sunmlib         use Sun medialib [default=no]"
   echo "  --enable-dc1394          enable IIDC-1394 grabbing using libdc1394"
   echo "                           and libraw1394 [default=no]"
   echo "  --enable-liba52          enable GPLed liba52 support [default=no]"
@@ -100,8 +104,6 @@ show_help(){
   echo "  --enable-amr_nb-fixed    use fixed point for amr-nb codec"
   echo "  --enable-amr_wb          enable amr_wb float audio codec"
   echo "  --enable-amr_if2         enable amr_wb IF2 audio codec"
-  echo "  --enable-gpl             allow use of GPL code, the resulting libav*"
-  echo "                           and ffmpeg will be under GPL [default=no]"
   echo ""
   echo "Advanced options (experts only):"
   echo "  --source-path=PATH       path to source code [$source_path]"
@@ -134,10 +136,7 @@ show_help(){
   echo "  --disable-ipv6           disable ipv6 support [default=no]"
   echo "  --disable-zlib           disable zlib [default=no]"
   echo "  --disable-vhook          disable video hooking support"
-  echo "  --enable-gprof           enable profiling with gprof [$gprof]"
   echo "  --disable-debug          disable debugging symbols"
-  echo "  --disable-opts           disable compiler optimizations"
-  echo "  --enable-extra-warnings  enable more compiler warnings"
   echo "  --disable-mpegaudio-hp   faster (but less accurate)"
   echo "                           MPEG audio decoding [default=no]"
   echo "  --disable-protocols      disable I/O protocols support [default=no]"
@@ -146,7 +145,6 @@ show_help(){
   echo "  --disable-ffplay         disable ffplay build"
   echo "  --enable-small           optimize for size instead of speed"
   echo "  --enable-memalign-hack   emulate memalign, interferes with memory debuggers"
-  echo "  --disable-strip          disable stripping of executables and shared libraries"
   echo "  --disable-encoder=NAME   disables encoder NAME"
   echo "  --enable-encoder=NAME    enables encoder NAME"
   echo "  --disable-decoder=NAME   disables decoder NAME"
@@ -162,6 +160,12 @@ show_help(){
   echo "  --enable-parser=NAME     enables parser NAME"
   echo "  --disable-parser=NAME    disables parser NAME"
   echo "  --disable-parsers        disables all parsers"
+  echo
+  echo "Developer options (useful when working on FFmpeg itself):"
+  echo "  --enable-gprof           enable profiling with gprof [$gprof]"
+  echo "  --disable-opts           disable compiler optimizations"
+  echo "  --enable-extra-warnings  enable more compiler warnings"
+  echo "  --disable-strip          disable stripping of executables and shared libraries"
   echo ""
   echo "NOTE: Object files are built at the place where configure is launched."
   exit 1