Drop ax_swig_enable_cxx.m4
The macro doesn't seem used at all
diff --git a/m4/ax_swig_enable_cxx.m4 b/m4/ax_swig_enable_cxx.m4
deleted file mode 100644
index c1eca8c..0000000
--- a/m4/ax_swig_enable_cxx.m4
+++ /dev/null
@@ -1,53 +0,0 @@
-# ===========================================================================
-# http://www.nongnu.org/autoconf-archive/ax_swig_enable_cxx.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-# AX_SWIG_ENABLE_CXX
-#
-# DESCRIPTION
-#
-# Enable SWIG C++ support. This affects all invocations of $(SWIG).
-#
-# LICENSE
-#
-# Copyright (c) 2008 Sebastian Huber <sebastian-huber@web.de>
-# Copyright (c) 2008 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
-# Copyright (c) 2008 Rafael Laboissiere <rafael@laboissiere.net>
-# Copyright (c) 2008 Andrew Collier <colliera@ukzn.ac.za>
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the
-# Free Software Foundation; either version 2 of the License, or (at your
-# option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-# As a special exception, the respective Autoconf Macro's copyright owner
-# gives unlimited permission to copy, distribute and modify the configure
-# scripts that are the output of Autoconf when processing the Macro. You
-# need not follow the terms of the GNU General Public License when using
-# or distributing such scripts, even though portions of the text of the
-# Macro appear in them. The GNU General Public License (GPL) does govern
-# all other use of the material that constitutes the Autoconf Macro.
-#
-# This special exception to the GPL applies to versions of the Autoconf
-# Macro released by the Autoconf Archive. When you make and distribute a
-# modified version of the Autoconf Macro, you may extend this special
-# exception to the GPL to apply to your modified version as well.
-
-AU_ALIAS([SWIG_ENABLE_CXX], [AX_SWIG_ENABLE_CXX])
-AC_DEFUN([AX_SWIG_ENABLE_CXX],[
- AC_REQUIRE([AC_PROG_SWIG])
- AC_REQUIRE([AC_PROG_CXX])
- if test "$SWIG" != "false"; then
- SWIG="$SWIG -c++"
- fi
-])
