- move the swig version check after the guile checks
this allows us to check for a different version of swig
based on the guile version that was detected
- use more recent autoconf macros for swig (from the autotools archive)
this give us more flexible error reporting
git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23560 57a11ea4-9604-0410-9ed3-97b8803252fd
