move remaining help text from include/usage.src.h

Signed-off-by: Pere Orga <gotrunks@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

miscutils/bbconfig.c

@@ -1,6 +1,12 @@
 /* vi: set sw=4 ts=4: */
 /* This file was released into the public domain by Paul Fox.
  */
+
+//usage:#define bbconfig_trivial_usage
+//usage:       ""
+//usage:#define bbconfig_full_usage "\n\n"
+//usage:       "Print the config file used by busybox build"
+
 #include "libbb.h"
 #include "bbconfigopts.h"
 #if ENABLE_FEATURE_COMPRESS_BBCONFIG