configure: sort entries

configure

@@ -165,10 +165,10 @@ Configuration options:
 External library support:
   --enable-avisynth        enable reading of AVISynth script files [no]
   --enable-bzlib           enable bzlib [autodetect]
-  --enable-libcelt         enable CELT decoding via libcelt [no]
   --enable-frei0r          enable frei0r video filtering
-  --enable-libaacplus      enable AAC+ encoding via libaacplus [no]
   --enable-gnutls          enable gnutls [no]
+  --enable-libaacplus      enable AAC+ encoding via libaacplus [no]
+  --enable-libcelt         enable CELT decoding via libcelt [no]
   --enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no]
   --enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]
   --enable-libopencv       enable video filtering via libopencv [no]
@@ -3054,11 +3054,11 @@ check_mathfunc truncf
 
 # these are off by default, so fail if requested and not available
 enabled avisynth   && require2 vfw32 "windows.h vfw.h" AVIFileInit -lavifil32
-enabled libcelt    && require libcelt celt/celt.h celt_decode -lcelt0
 enabled frei0r     && { check_header frei0r.h || die "ERROR: frei0r.h header not found"; }
+enabled gnutls     && require_pkg_config gnutls gnutls/gnutls.h gnutls_global_init
 enabled libaacplus && require  "libaacplus >= 2.0.0" aacplus.h aacplusEncOpen -laacplus
+enabled libcelt    && require libcelt celt/celt.h celt_decode -lcelt0
 enabled libdc1394  && require_pkg_config libdc1394-2 dc1394/dc1394.h dc1394_new
-enabled gnutls     && require_pkg_config gnutls gnutls/gnutls.h gnutls_global_init
 enabled libdirac   && require_pkg_config dirac                          \
     "libdirac_decoder/dirac_parser.h libdirac_encoder/dirac_encoder.h"  \
     "dirac_decoder_init dirac_encoder_init"
@@ -3392,14 +3392,14 @@ echo "libdxva2 enabled          ${dxva2-no}"
 echo "libva enabled             ${vaapi-no}"
 echo "libvdpau enabled          ${vdpau-no}"
 echo "AVISynth enabled          ${avisynth-no}"
-echo "libcelt enabled           ${libcelt-no}"
 echo "frei0r enabled            ${frei0r-no}"
 echo "gnutls enabled            ${gnutls-no}"
+echo "libaacplus enabled        ${libaacplus-no}"
 echo "libcdio support           ${libcdio-no}"
+echo "libcelt enabled           ${libcelt-no}"
 echo "libdc1394 support         ${libdc1394-no}"
 echo "libdirac enabled          ${libdirac-no}"
 echo "libfaac enabled           ${libfaac-no}"
-echo "libaacplus enabled        ${libaacplus-no}"
 echo "libgsm enabled            ${libgsm-no}"
 echo "libmodplug enabled        ${libmodplug-no}"
 echo "libmp3lame enabled        ${libmp3lame-no}"