configs/sim/src: Add logic to test localtime and TZ database. See apps/system/README.txt for info

libc/Kconfig

@@ -281,15 +281,30 @@ if LIBC_LOCALTIME
 
 config LIBC_TZ_MAX_TIMES
 	int "Maximum number of times in timezone"
-	default 8
+	default 370
+	---help---
+		Timezone files with more than this number of times will not be usedi
+		(tmecnt).
+
+		Warning: Some files in IANA TZ database include many more times than
+		this.  The current posixrules file, for example, has timecnt = 236.
+		The value of TX_MAX_ITMES in the tzfile.h header file on my Linux
+		system is 370.  You may want to reduce this value for a smaller
+		footprint.
 
 config LIBC_TZ_MAX_TYPES
 	int "Maximum number of TZ types"
-	default 8
+	default 20
+	---help---
+		Maximum number of local time types.  You may want to reduce this value
+		for a smaller footprint.
 
 config LIBC_TZDIR
 	string "zoneinfo directory path"
 	default "/etc/zoneinfo"
+	---help---
+		This is the full path to the location where the TZ database is expected
+		to be found.
 
 endif