[PATCH] kerberos support in ra_serf

Attached makes the configure & make system detect the installed gssapi
include file and library file. As I'm not too familiar with svn's build
system, does anyone want to do a quick review before I commit it?

thanks.

Lieven

[[[
Use an installed GSSAPI library to get Kerberos authentication support
in ra_serf.

* build/ac-macros/gssapi.m4:
   (SVN_RA_SERF_LIB_GSSAPI): New macro that finds a gssapi installation.
* aclocal.m4: Include build/ac-macros/gssapi.m4
* configure.ac: Call SVN_RA_SERF_LIB_GSSAPI and set the right defines to
    enable Kerberos authentication in ra_serf.
* Makefile.in: Add in necessary values to let the build system know
    where to find the gssapi include and lib files.
* build.conf
   (gssapi): Add gssapi as a known lib, so that the build system will
    pull in the right linker flags.

* subversion/libsvn_ra_serf/auth.c
* subversion/libsvn_ra_serf/auth_kerb.c
   (SVN_RA_SERF_GSSAPI_ENABLED): Renamed to SVN_RA_SERF_HAVE_GSSAPI.
]]]

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