* configure.ac: Prefer swig-3.0 when available.

NEWS

@@ -32,6 +32,7 @@ New in spot 1.2.5a (not yet released)
       libstd++ has also been fixed.
     - all parsers would report wrong line numbers while processing
       files with DOS style newlines.
+    - add support for SWIG 3.0.
 
 New in spot 1.2.5 (2014-08-21)
 

configure.ac

@@ -117,9 +117,9 @@ AC_CHECK_PROG([EMACS], [emacs], [emacs])
 AC_CHECK_PROG([LBTT_TRANSLATE], [lbtt-translate], [lbtt-translate])
 AX_CHECK_VALGRIND
 AC_CHECK_PROG([WRING2LBTT], [wring2lbtt], [wring2lbtt])
-# Debian has a binary for SWIG 2.0 named swig2.0 and they kept swig as
-# an alias for swig-1.3.  Let's use the former when available.
-AC_CHECK_PROGS([SWIG], [swig2.0 swig], [swig])
+# Debian has a binary for SWIG 3.0 named swig3.0 and they kept swig as
+# an alias for swig-2.0.  Let's use the former when available.
+AC_CHECK_PROGS([SWIG], [swig3.0 swig], [swig])
 
 AC_SUBST([CROSS_COMPILING], [$cross_compiling])