Merge pull request #4335 from colrdavidson/datetime_tz

Add Timezone Support to Odin

core/sys/windows/icu.odin

@@ -0,0 +1,14 @@
+#+build windows
+package sys_windows
+
+foreign import "system:icu.lib"
+
+UError :: enum i32 {
+	U_ZERO_ERROR = 0,
+}
+
+@(default_calling_convention="system")
+foreign icu {
+	ucal_getWindowsTimeZoneID :: proc(id: wstring, len: i32, winid: wstring, winidCapacity: i32, status: ^UError) -> i32 ---
+	ucal_getDefaultTimeZone :: proc(result: wstring, cap: i32, status: ^UError) -> i32 ---
+}