Extract usage information into a separate file.

date.c

@@ -39,17 +39,6 @@
    an RFC 822 complient date output for shell scripting
    mail commands */
 
-static const char date_usage[] = "date [OPTION]... [+FORMAT]\n"
-	"  or:  date [OPTION] [MMDDhhmm[[CC]YY][.ss]]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
-	"\nDisplays the current time in the given FORMAT, or sets the system date.\n"
-	"\nOptions:\n\t-R\tOutputs RFC-822 compliant date string\n"
-	"\t-s\tSets time described by STRING\n"
-	"\t-u\tPrints or sets Coordinated Universal Time\n"
-#endif
-	;
-
-
 /* Input parsing code is always bulky - used heavy duty libc stuff as
    much as possible, missed out a lot of bounds checking */