Revision 1699719

On the 1.3.x branch:

Merge build system fixes from trunk:
r2155: Fix build when GSSAPI not in default include path
r2156: OpenBSD specific: Always map all LIBPATH entries into RPATH,
       not just for Solaris.
r2161: Mac OSX specific: Use major version only in the install name of
       the shared library
r2162: Enable checksum generation in Windows shared libraries for
       release builds.
r2163: Use for the shared library version string both MAJOR and MINOR version.