Remove --enable-static and --disable-shared from help output.

Only one of --enable or --disable should be in the help output.

Originally committed as revision 16758 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -68,10 +68,8 @@ show_help(){
   echo "  --shlibdir=DIR           install shared libs in DIR [PREFIX/lib]"
   echo "  --incdir=DIR             install includes in DIR [PREFIX/include]"
   echo "  --mandir=DIR             install man page in DIR [PREFIX/share/man]"
-  echo "  --enable-static          build static libraries [yes]"
   echo "  --disable-static         do not build static libraries [no]"
   echo "  --enable-shared          build shared libraries [no]"
-  echo "  --disable-shared         do not build shared libraries [yes]"
   echo "  --enable-gpl             allow use of GPL code, the resulting libs"
   echo "                           and binaries will be under GPL [no]"
   echo "  --enable-nonfree         allow use of nonfree code, the resulting libs"