[scponly] subversion support

[Dimitri Papadopoulos-Orfanos]

> For some reason config.h did not define SVN_COMPAT although it had been 
> generated using the --enable-svn-compat option flag:

Worse, when I configure with --disable-sftp config.h still defines 
ENABLE_SFTP (this happens with the current CVS version):
	$ ./configure --prefix=/usr/local \
		--enable-svn-compat \
		--disable-scp-compat \
		--disable-gftp-compat \
		--disable-winscp-compat \
		--disable-sftp \
		--disable-wildcards
	[...]
	$ cat config.h
	/* config.h.  Generated by configure.  */
	#define PACKAGE_NAME ""
	#define PACKAGE_VERSION ""
	#define PACKAGE_BUGREPORT ""
	
	/* Features */
	/* #undef UNIX_COMPAT */
	/* #undef IRIX_COMPAT */
	/* #undef WINSCP_COMPAT */
	/* #undef GFTP_COMPAT */
	/* #undef RSYNC_COMPAT */
	/* #undef UNISON_COMPAT */
	/* #undef ENABLE_SCP2 */
	#define ENABLE_SFTP 1
	/* #undef ENABLE_WILDCARDS */
	#define RESTRICTIVE_FILENAMES 1
	/* #undef CHROOTED_NAME */
	#define HAVE_WORDEXP 1
	#define HAVE_GLOB 1
	[...]
	$

Dimitri Papadopoulos