Address MSVC warning and CID 492209 with typecast of time_t to uint32_t

yes, this is a Y2K38 (or Y2106) issue, but we should have that worked out
when upgrading to the next libmozjs.

Need something like NUMBER_TO_JSVAL() and equivalent LAZY_NUMBER macro that
can deal with >32-bit ints correctly (or just always convert to double?).

src/sbbs3/js_system.c

@@ -2695,7 +2695,7 @@ static JSBool js_system_resolve(JSContext *cx, JSObject *obj, jsid id)
 	LAZY_STRING("git_branch", git_branch);
 	LAZY_STRING("git_hash", git_hash);
 	LAZY_STRING("git_date", git_date);
-	LAZY_INTEGER("git_time", git_time);
+	LAZY_INTEGER("git_time", (uint32_t)git_time);
 
 	LAZY_STRING("platform", PLATFORM_DESC);
 	LAZY_STRING("architecture", ARCHITECTURE_DESC);