[tz] Mexico on track to abolish DST

[Paul Eggert]

Yesterday Mexico's Chamber of Deputies voted 445–33 to abolish DST in 
most of Mexico, and although there are more hurdles I expect this to 
become law. When that happens, I hope the following simple patch will 
suffice; it merely changes "max" to "2022" in the last two Mexico Rule 
lines. We'll also need to add commentary citing the law, etc., but you 
can try this patch now if you like, to debug any applications involving 
future time in Mexico.

Today timeanddate updated their English-language summary of this 
<https://www.timeanddate.com/news/time/mexico-remove-dst-2022.html>.

I haven't installed the following.

	diff --git a/northamerica b/northamerica
	index da84f354..2466d627 100644
	--- a/northamerica
	+++ b/northamerica
	@@ -2634,2 +2634,2 @@ Rule	Mexico	2001	only	-	Sep	lastSun	2:00	0	S
	-Rule	Mexico	2002	max	-	Apr	Sun>=1	2:00	1:00	D
	-Rule	Mexico	2002	max	-	Oct	lastSun	2:00	0	S
	+Rule	Mexico	2002	2022	-	Apr	Sun>=1	2:00	1:00	D
	+Rule	Mexico	2002	2022	-	Oct	lastSun	2:00	0	S