Move zlib/bzlib options to the external library section of the help output and

mention the enable variant of the option since they are disabled by default.

Originally committed as revision 15860 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -89,6 +89,7 @@ show_help(){
   echo "External library support:"
   echo "  --enable-mlib            enable Sun medialib [no]"
   echo "  --enable-avisynth        enable reading of AVISynth script files [no]"
+  echo "  --enable-bzlib           enable bzlib [no]"
   echo "  --enable-libamr-nb       enable libamr-nb floating point audio codec"
   echo "  --enable-libamr-wb       enable libamr-wb floating point audio codec"
   echo "  --enable-libdc1394       enable IIDC-1394 grabbing using libdc1394"
@@ -109,6 +110,7 @@ show_help(){
   echo "  --enable-libx264         enable H.264 encoding via x264 [no]"
   echo "  --enable-libxvid         enable Xvid encoding via xvidcore,"
   echo "                           native MPEG-4/Xvid encoder exists [no]"
+  echo "  --enable-zlib            enable zlib [no]"
   echo ""
   echo "Advanced options (experts only):"
   echo "  --source-path=PATH       path to source code [$source_path]"
@@ -136,8 +138,6 @@ show_help(){
   echo "  --disable-altivec        disable AltiVec optimizations"
   echo "  --disable-network        disable network support [no]"
   echo "  --disable-ipv6           disable IPv6 support [no]"
-  echo "  --disable-zlib           disable zlib [no]"
-  echo "  --disable-bzlib          disable bzlib [no]"
   echo "  --disable-vhook          disable video hooking support"
   echo "  --disable-mpegaudio-hp   faster (but less accurate)"
   echo "                           MPEG audio decoding [no]"