Drop support for DJGPP, MS-DOS, Windows 95/98/ME

Basically a backport and squash-in of three Automake-NG commits:
v1.12.1-447-g041fe15, v1.12-343-g4526363, v1.12-341-gc853c20,
plus proper simplifications of the ylwrap script.

See also:
<http://lists.gnu.org/archive/html/automake-ng/2012-05/msg00104.html>

* automake.in (BEGIN): Don't override $ENV{SHELL} for DJGPP.
(handle_libtool): Do not bother cleaning '_libs' directories, they
are only used by Libtool on MS-DOS (and we no longer support that
setup).
* syntax-checks.mk (automake_diff_no): Adjust, as now there are only
seven (not eight) different lines between 'automake.in' and 'automake'.
* bootstrap.sh: Don't special case the default value for BOOTSTRAP_SHELL
on DJGPP.  While we are at, allow that variable to be overridden from
the environment. Also, adjust comments: we don't use "ln -s" not because
it's not properly supported by DJGPP, but because it might not be
properly supported by MinGW/MSYS.
* configure.ac (MODIFICATION_DELAY): Define to '2' unconditionally, as
we no longer have to cater to quirks of Windows 95/98/ME.
* lib/am/texibuild.am: Remove support for '*.iNN' files used on DJGPP.
* lib/am/texinfos.am: Likewise.
* lib/ylwrap: Remove support for DOS-specific filenames for bison
output.
* t/txinfo19.sh: Remove as obsolete.
* t/list-of-tests.mk: Adjust.
* NEWS: Update.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

1 files changed, 1 insertions, 16 deletions

diff --git a/lib/ylwrap b/lib/ylwrap
index b5c673d5f..d59f6aa6e 100755
--- a/lib/ylwrap
+++ b/lib/ylwrap
@@ -1,7 +1,7 @@
 #! /bin/sh
 # ylwrap - wrapper for lex/yacc invocations.
 
-scriptversion=2012-12-21.17; # UTC
+scriptversion=2012-12-28.20; # UTC
 
 # Copyright (C) 1996-2012 Free Software Foundation, Inc.
 #
@@ -111,14 +111,6 @@ case "$input" in
 esac
 input_rx=`get_dirname "$input" | quote_for_sed`
 
-# Since DOS filename conventions don't allow two dots,
-# the DOS version of Bison writes out y_tab.c instead of y.tab.c
-# and y_tab.h instead of y.tab.h. Test to see if this is the case.
-y_tab_nodot=false
-if test -f y_tab.c || test -f y_tab.h; then
-  y_tab_nodot=true
-fi
-
 # The parser itself, the first file, is the destination of the .y.c
 # rule in the Makefile.
 parser=$1
@@ -138,13 +130,6 @@ while test "$#" -ne 0; do
     break
   fi
   from=$1
-  # Handle y_tab.c and y_tab.h output by DOS
-  if $y_tab_nodot; then
-    case $from in
-      "y.tab.c") from=y_tab.c;;
-      "y.tab.h") from=y_tab.h;;
-    esac
-  fi
   shift
   to=$1
   shift