swig-py: bump up required SWIG version to 1.3.40

It turned out that on SWIG 1.3.24 - 1.3.38, it causes syntax error in
svn_global.swg, and on SWIG 1.3.39, it produce broken C code. 

* build/ac-macros/swig.m4 (SVN_FIND_SWIG, SVN_DETERMINE_SWIG_OPTS):
  Replace least version number of SWIG from 1.3.24 to 1.3.40

* subversion/bindings/swig/INSTALL
  (BUILDING SWIG BINDINGS FOR SVN ON UNIX Step 1):
   It turned out SWIG 1.3.x except SWIG 1.3.40 does not work and
   1.3.40 is now tested (at least it passes the test suite).


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1928524 13f79535-47bb-0310-9956-ffa450edef68
2 files changed