Properly check for SWIG version 2.0.0 and later.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@19287 57a11ea4-9604-0410-9ed3-97b8803252fd

macros/ac_pkg_swig.m4

@@ -67,9 +67,11 @@ AC_DEFUN([AC_PROG_SWIG],[
                         if test -z "$available_patch" ; then
                                 [available_patch=0]
                         fi
-                        if test $available_major -ne $required_major \
-                                -o $available_minor -ne $required_minor \
-                                -o $available_patch -lt $required_patch ; then
+                        if test $available_major -lt $required_major \
+                                -o \( $available_major -eq $required_major \
+                                    -a \( $available_minor -lt $required_minor \
+                                        -o \( $available_minor -eq $required_minor \
+                                            -a $available_patch -lt $required_patch \) \) \) ; then
                                 AC_MSG_ERROR([SWIG version >= $1 is required.  You have $swig_version.  You should look at http://www.swig.org])
                                 SWIG='echo "Error: SWIG version >= $1 is required.  You have '"$swig_version"'.  You should look at http://www.swig.org" ; false'
                         else