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

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

archival/dpkg.c

@@ -14,7 +14,6 @@
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
-
 /*
  * known difference between busybox dpkg and the official dpkg that i don't
  * consider important, its worth keeping a note of differences anyway, just to
@@ -27,6 +26,17 @@
  *  - (unknown, please let me know when you find any)
  */
 
+//config:config DPKG
+//config:	bool "dpkg"
+//config:	default n
+//config:	select FEATURE_SEAMLESS_GZ
+//config:	help
+//config:	  dpkg is a medium-level tool to install, build, remove and manage
+//config:	  Debian packages.
+//config:
+//config:	  This implementation of dpkg has a number of limitations,
+//config:	  you should use the official dpkg if possible.
+
 //applet:IF_DPKG(APPLET(dpkg, BB_DIR_USR_BIN, BB_SUID_DROP))
 //kbuild:lib-$(CONFIG_DPKG) += dpkg.o