archival/*: move "config:" snippets into .c files

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

archival/cpio.c

@@ -13,6 +13,35 @@
 #include "libbb.h"
 #include "bb_archive.h"
 
+//config:config CPIO
+//config:	bool "cpio"
+//config:	default y
+//config:	help
+//config:	  cpio is an archival utility program used to create, modify, and
+//config:	  extract contents from archives.
+//config:	  cpio has 110 bytes of overheads for every stored file.
+//config:
+//config:	  This implementation of cpio can extract cpio archives created in the
+//config:	  "newc" or "crc" format, it cannot create or modify them.
+//config:
+//config:	  Unless you have a specific application which requires cpio, you
+//config:	  should probably say N here.
+//config:
+//config:config FEATURE_CPIO_O
+//config:	bool "Support for archive creation"
+//config:	default y
+//config:	depends on CPIO
+//config:	help
+//config:	  This implementation of cpio can create cpio archives in the "newc"
+//config:	  format only.
+//config:
+//config:config FEATURE_CPIO_P
+//config:	bool "Support for passthrough mode"
+//config:	default y
+//config:	depends on FEATURE_CPIO_O
+//config:	help
+//config:	  Passthrough mode. Rarely used.
+
 //applet:IF_CPIO(APPLET(cpio, BB_DIR_BIN, BB_SUID_DROP))
 //kbuild:lib-$(CONFIG_CPIO) += cpio.o