x11/xsnow: update to 3.5.3 release (+)

version 3.5.3
01: main.c: drawit(): do now draw the first second or so to hide
    unstable configurations of scenery, stars, etc.
    fallensnow.c, birds.c, aurora.c: make them C++ compliant by
      rewriting goto and typecast pointer assignment
    meteor.c: rewrite goto
    santa.c: continue Santa animation, irrespective of His speed
    fallensnow.c: paint fallensnow one pixel higher
    fallensnow.c: generate more snow when Santa is ploughing
02: loadmeasure.c: maximum 5 warnings about to busy system
03: doit.h: change defaults for aurora_width/height to 60/30

Full changelog:	https://www.ratrabbit.nl/ratrabbit/xsnow/changelog/index.html

x11/xsnow/Makefile

 PORTNAME=	xsnow
-PORTVERSION=	3.5.2
+PORTVERSION=	3.5.3
 CATEGORIES=	x11
 MASTER_SITES=	SF/${PORTNAME}/
 

x11/xsnow/distinfo

-TIMESTAMP = 1661211789
-SHA256 (xsnow-3.5.2.tar.gz) = 9bde92d8d023ff6c2a26beb91905ad6f65aacf4de67296743fc710388a23ef7d
-SIZE (xsnow-3.5.2.tar.gz) = 474073
+TIMESTAMP = 1665420845
+SHA256 (xsnow-3.5.3.tar.gz) = c3f482ae98b4685d25cafad935fddb42b01ade725c7a416b737861bae71deec1
+SIZE (xsnow-3.5.3.tar.gz) = 474540