Update the way we handle directories supplied by the user:
- the tarball directory is considered as a local copy, and tarballs are copied to a working area,
- the sources and build directories (CT_SRC_DIR and CT_BUILD_DIR) are now computed, and no longer an option,
- the build dir has been renamed from 'build' to 'targets'.
That should ease preparing a tarball of the resulting target.

 #!/bin/sh

 # This scripts extracts a crosstool-ng configuration from the log file

 # of a toolchain build with crosstool-ng.

 # Usage: $0 <logfile>

 cat "$1" |awk '

 BEGIN {

   dump = 0;

 }

 $0~/Dumping crosstool-NG configuration: done in.+s$/ {

   dump = 0;

 }

 dump == 1 { $1 = "" }

 dump == 1

 $0~/Dumping crosstool-NG configuration$/ {

   dump = 1;

 }

 ' |cut -d ' ' -f 2-