Prepare for compiling with wxWidgets 3.1.1

- Upped version number to Audacity 2.3.0 in configure.ac
- configure.ac now wants 3.1.1 but still accepts 3.0.0 (for top level, lib-widgets-extra and mod-nyq-bench)
- .travis.yml now apt-gets autopoint.  This allows us to do an autoreconf -ivf on Travis, IF we want to, but i snot used yet.
- FileDialog MakeFile.am now has LDFLAGS to resolve libtools issue on Travis with missing --tags=CXX

lib-src/FileDialog/Makefile.am

@@ -2,6 +2,7 @@ ACLOCAL_AMFLAGS = -I m4
 
 lib_LTLIBRARIES = libFileDialog.la
 
+libFileDialog_la_LIBTOOLFLAGS = --tag=CXX
 libFileDialog_la_CPPFLAGS = $(WX_CXXFLAGS) -Wno-deprecated-declarations
 libFileDialog_la_LIBADD = $(WX_LIBS)
 libFileDialog_la_SOURCES = FileDialog.cpp FileDialog.h

lib-src/lib-widget-extra/configure.ac

@@ -53,10 +53,10 @@ AC_ARG_ENABLE(debug,
 
 AC_ARG_WITH(wx-version,
             [AS_HELP_STRING([--with-wx-version],
-                           [select wxWidgets version (if both installed) [2.8,]])],
+                           [select wxWidgets version (if both installed) [3.1,]])],
            wx_preference="--version=$withval",
            wx_preference="")
-dnl Right now only support wx 3.0
+dnl Right now only support wx 3.1
 
 dnl ----------------------------------------------------
 dnl If user asked for debug, put debug in compiler flags
@@ -99,12 +99,12 @@ fi
 dnl --- check for required libraries ---
 
 dnl wxWidgets -- we assume that if wx-config is found, wxWidgets is successfully installed.
-AC_PATH_PROGS(WX_CONFIG, wx-config wx-config-3.0, no, $PATH:/usr/local/bin )
+AC_PATH_PROGS(WX_CONFIG, wx-config wx-config-3.1, no, $PATH:/usr/local/bin )
 if [[ "$WX_CONFIG" = "no" ]] ; then
    AC_MSG_ERROR("Could not find wx-config: is wxWidgets installed? is wx-config in your path?")
 fi
 
-dnl --- Check that the wx version is at least 2.8.x ---
+dnl --- Check that the wx version is at least 3.1.x---
 
 if test "x$debug_preference" = "xyes"; then
    dnl want debug wx as well
@@ -119,15 +119,15 @@ wxconfigargs="$static_wx_preference $unicode_preference $wxconfigargs $wx_prefer
 
 wx_version=`${WX_CONFIG} $wxconfigargs --version`
 
-AC_MSG_NOTICE([Checking that the chosen version of wxWidgets is 2.8.x])
+AC_MSG_NOTICE([Checking that the chosen version of wxWidgets is 3.1.x (or 3.0.x)])
 
 case "${wx_version}" in
-  2.8.* | 3.0.*)
+  3.1.* | 3.0.*)
     echo "Great, you're using wxWidgets ${wx_version}!"
     ;;
   *)
   wx_list=`${WX_CONFIG} --list`
-  AC_MSG_ERROR([Unable to locate a suitable configuration of wxWidgets v2.8.x or higher.
+  AC_MSG_ERROR([Unable to locate a suitable configuration of wxWidgets v3.0.x or higher.
 The currently available configurations are listed below.  If necessary, either
 install the package for your distribution or download the latest version of
 wxWidgets

lib-src/mod-nyq-bench/configure.ac

@@ -54,7 +54,7 @@ AC_ARG_WITH(wx-config,
             wx_config="")
 
 dnl wxWidgets -- we assume that if wx-config is found, wxWidgets is successfully installed.
-AC_PATH_PROGS(WX_CONFIG, wx-config wx-config-3.0, no, $PATH:/usr/local/bin )
+AC_PATH_PROGS(WX_CONFIG, wx-config wx-config-3.1, no, $PATH:/usr/local/bin )
 if [[ "$WX_CONFIG" = "no" ]] ; then
    AC_MSG_ERROR("Could not find wx-config: is wxWidgets installed? is wx-config in your path?")
 fi