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Fix timestamp symbols on Windows (partially)

Windows does not honor `%F` nor `%T` in `strftime`. These are worked around
by writing the full format they serve as a short for.
However, Windows also treats `%z` and `%Z` identically, where SUS instead
requires `%z` to output a ±XXXX offset.
Since the current information is broken (no information), this isn't *breaking*
anything, but at least provides something a human will probably understand.
`__ISO_8601_UTC__` is unaffected because it hardcodes the timezone character,
only `__ISO_8601_LOCAL__` suffers from this.

--- a/src/asm/symbol.c

+++ b/src/asm/symbol.c

@@ -737,7 +737,8 @@

 	sym_AddSet("_RS", 0);

-	if (time(&now) != -1) {

+	now = time(NULL);

+	if (now != (time_t)-1) {

 		const struct tm *time_local = localtime(&now);

 		strftime(SavedTIME, sizeof(SavedTIME), "\"%H:%M:%S\"",

@@ -745,13 +746,13 @@

 		strftime(SavedDATE, sizeof(SavedDATE), "\"%d %B %Y\"",

 			 time_local);

 		strftime(SavedTIMESTAMP_ISO8601_LOCAL,

-			 sizeof(SavedTIMESTAMP_ISO8601_LOCAL), "\"%FT%T%z\"",

+			 sizeof(SavedTIMESTAMP_ISO8601_LOCAL), "\"%Y-%m-%dT%H-%M-%S%z\"",

 			 time_local);

 		const struct tm *time_utc = gmtime(&now);

 		strftime(SavedTIMESTAMP_ISO8601_UTC,

-			 sizeof(SavedTIMESTAMP_ISO8601_UTC), "\"%FT%TZ\"",

+			 sizeof(SavedTIMESTAMP_ISO8601_UTC), "\"%Y-%m-%dT%H-%M-%SZ\"",

 			 time_utc);

 		strftime(SavedDAY, sizeof(SavedDAY), "%d", time_utc);