{maint} scanner: restore a missing start condition

[Akim Demaille]

commit dbfcf7a89f749a979031931202b432243ea712bd
Author: Akim Demaille <address@hidden>
Date:   Mon Jul 30 14:54:27 2012 +0200

    scanner: restore a missing start condition
    
    $ flex src/scan-skel.l
    src/scan-skel.l:145: multiple <<EOF>> rules for start condition 
SC_AT_DIRECTIVE_ARGS
    src/scan-skel.l:145: multiple <<EOF>> rules for start condition 
SC_AT_DIRECTIVE_SKIP_WS
    This is warning, and it seems there are no means to make it an error.
    
    * src/scan-skel.l: Restore the start-condition INITIAL for an <<EOF>>
    clause.

diff --git a/src/scan-skel.l b/src/scan-skel.l
index 862b34f..ed61b5c 100644
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -91,7 +91,7 @@ static void fail_for_invalid_at (char const *at);
 \n            out_lineno++; ECHO;
 address@hidden       ECHO;
 
-<<EOF>> {
+<INITIAL><<EOF>> {
   if (outname)
     {
       free (outname);