mc: various makefile/compile time changes

- add & reorder new compile time options with help text
- all options are disabled by default, to reduce space req.
- remove invalid mc configure options
- fix broken makefile logic to enable/disable mc options

Signed-off-by: Dirk Brenken <dibdot@gmail.com>

utils/mc/Config.in

@@ -1,20 +1,60 @@
 menu "Configuration"
 	depends on PACKAGE_mc
 
-config MC_DIFF_VIEWER
-	bool "Compile with diff viewer"
+config MC_DIFFVIEWER
+	bool "Enable internal diff viewer"
 	default n
+	help
+           This option enables the built-in diff viewer.
+           Disabled by default.
 
 config MC_EDITOR
 	bool "Enable internal editor"
 	default n
+	help
+           This option enables the built-in file editor.
+           Disabled by default.
 
 config MC_SUBSHELL
-	bool "Compile in concurrent subshell"
+	bool "Enable concurrent subshell"
 	default n
+	help
+           This option enables concurrent subshell support.
+           Disabled by default.
 
-config MC_DISABLE_VFS
-	bool "Disable VFS"
-	default y
+config MC_LARGEFILE
+	bool "Enable largefile support"
+	default n
+	help
+           This option enables support for large files (> 2 GB).
+           Disabled by default.
+
+config MC_BACKGROUND
+	bool "Enable background operations"
+	default n
+	help
+           This option enables support for background operations which
+           allow to perform some tasks such as copying files in a
+           separate background process. Background code is known
+           to be less stable than the rest of the code.
+           Disabled by default.
+
+config MC_CHARSET
+	bool "Enable charset support"
+	default n
+	help
+           This option adds support for selecting character set of the text in
+           the internal viewer and editor and converting it on the fly.
+           The implementation is currently incomplete.
+           Disabled by default.
+
+config MC_VFS
+	bool "Enable virtual filesystem support"
+	default n
+	help
+           This option enables the Virtual File System switch code to get
+           transparent access to the following file systems:
+           cpio, tar, fish, sfs, ftp, sftp, extfs, smb.
+           Disabled by default.
 
 endmenu