Fix gnulib-tool sed script de-commentation for AIX sed.

[Ralf Wildenhues]

AIX sed copes with unindented comments, but fails over indentation with
space or TAB:

$ echo | sed -e '# comment ' -e ' #indented comment'
sed: 0602-403  #indented comment is not a recognized function.
$ echo | sed -e '       #indented comment'
sed: 0602-403   #indented comment is not a recognized function.

OK to push this patch to fix gnulib-tool?

Thanks,
Ralf

2010-08-21  Ralf Wildenhues  <address@hidden>

        Fix gnulib-tool sed script de-commentation for AIX sed.
        * gnulib-tool (sed_comments): Try indented comments, for AIX 5.3
        sed.

diff --git a/gnulib-tool b/gnulib-tool
index bc967e3..b606ad6 100755
--- a/gnulib-tool
+++ b/gnulib-tool
@@ -109,10 +109,10 @@ fi
 sed_noop='s,x,x,'
 
 # sed_comments is true or false, depending whether 'sed' supports comments.
-# (The GNU autoconf doc says that sed comments are not portable, but does
-# not say which 'sed' versions are affected.)
+# AIX 5.3 sed barfs over indented comments.
 if echo fo | sed -e 's/f/g/
 # s/o/u/
+ # indented comment
 s/o/e/' 2>/dev/null | grep ge > /dev/null; then
   sed_comments=true
 else