improve "gnulib-tool --version"

[Bruno Haible]

Currently, "gnulib-tool --version" works better when called from the
gnulib main directory than from any other directory:

$ ./gnulib-tool --version | head -1
gnulib-tool (GNU gnulib 2008-09-26 18:13:32) 0.0.1070-1d542
$ cd modules
$ ../gnulib-tool --version | head -1
gnulib-tool (GNU gnulib 2008-09-26 18:13:32) UNKNOWN

This fixes it.


2008-09-26  Bruno Haible  <address@hidden>

        * gnulib-tool (func_version): Change directory to $gnulib_dir before
        invoking git-version-gen.

--- gnulib-tool.orig    2008-09-26 20:31:09.000000000 +0200
+++ gnulib-tool 2008-09-26 20:26:48.000000000 +0200
@@ -216,7 +216,7 @@
     date=`echo "$date" | sed -e "$sed_year_before_time"`
     # Use GNU date to compute the time in GMT.
     date=`date -d "$date" -u +"%Y-%m-%d %H:%M:%S"`
-    version=' '`"$gnulib_dir"/build-aux/git-version-gen /dev/null | sed -e 
's/-dirty/-modified/'`
+    version=' '`cd "$gnulib_dir" && ./build-aux/git-version-gen /dev/null | 
sed -e 's/-dirty/-modified/'`
   else
     if test -d "$gnulib_dir"/CVS \
        && (cvs --version) >/dev/null 2>/dev/null; then