Ticket #4420: fail to build with only SFTP network VFS enabled.

  * m4.include/mc-vfs.m4: use $enable_vfs_sftp to test functions
    required for network VFSes. Define ENABLE_VFS_NET preprocessor
    macro here...
  * lib/vfs/vfs.h: ...not here.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

Author: aborodin

lib/vfs/vfs.h

@@ -27,10 +27,6 @@
 
 #define VFS_CLASS(a) ((struct vfs_class *) (a))
 
-#if defined (ENABLE_VFS_FTP) || defined (ENABLE_VFS_FISH)
-#define ENABLE_VFS_NET 1
-#endif
-
 /**
  * This is the type of callback function passed to vfs_fill_names.
  * It gets the name of the virtual file system as its first argument.

m4.include/mc-vfs.m4

@@ -44,6 +44,7 @@ AC_DEFUN([mc_ENABLE_VFS_NET],
 	AC_CHECK_RPC
 
 	enable_vfs_net=yes
+	AC_DEFINE(ENABLE_VFS_NET, [1], [Define to enable network VFSes support])
     fi
 ])
 
@@ -79,7 +80,7 @@ AC_DEFUN([mc_VFS_CHECKS],
 
     AM_CONDITIONAL(ENABLE_VFS, [test x"$enable_vfs" = x"yes"])
 
-    if test x"$enable_vfs_ftp" = x"yes" -o x"$enable_vfs_fish" = x"yes"; then
+    if test x"$enable_vfs_ftp" = x"yes" -o x"$enable_vfs_fish" = x"yes" -o x"$enable_vfs_sftp" = x"yes"; then
 	mc_ENABLE_VFS_NET
     fi