* cygcheck.cc (dump_sysinfo): Fix multiple Cygwin DLL test.

	* cygcheck.cc (dump_sysinfo): Fix multiple Cygwin DLL test.
	* path.cc: Fetch mount points from fstab files instead of from
	registry.  Use adapted functions copied from Cygwin DLL.
	(mnt_t): Drop issys member.  Define as "mnt_t" instead of "struct mnt_t"
	subsequently.
	(max_mount_entry): New variable.
	(unconvert_slashes): Move to earlier location in file.  Make inline.
	(find2): Remove.
	(get_cygdrive0): Remove.
	(get_cygdrive): Remove.
	(skip_ws): New function.
	(find_ws): Ditto.
	(conv_fstab_spaces): Ditto.
	(read_flags): Ditto.
	(from_fstab_line): Ditto.
	(get_user): Ditto.
	(from_fstab): Ditto.
	(mnt_sort): Ditto.
	(read_mounts): Drop old registry code.  Fetch
	"Software\Cygwin\Setup\rootdir" value from HKCU or HKLM key.  Use
	rootdir extracted from module path as fallback.  Call from_fstab for
	nouser and user mount points.
	(setmntent): Check max_mount_entry to test if read_mounts must be
	called.
	(getmntent): Use MOUNT_SYSTEM flag instead of mnt_t's issys member.