bugfix update for sdl2

This is a straightforward-looking bugfix update for sdl2 (famous last
words...). There are no symbol changes and most changes affect other
operating systems [1]. I've built and run a couple of the consumers and
no issues found.

ok? if I don't hear back in the next days, I'm planning to go ahead with
this, but feedback always welcome!...

[1] https://github.com/libsdl-org/SDL/releases/tag/release-2.28.2

Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/sdl2/Makefile,v
retrieving revision 1.47
diff -u -p -r1.47 Makefile
--- Makefile 28 Jul 2023 01:15:02 -0000 1.47
+++ Makefile 3 Aug 2023 05:26:21 -0000
@@ -1,9 +1,8 @@
COMMENT= cross-platform multimedia library

-V= 2.28.1
+V= 2.28.2
DISTNAME= SDL2-${V}
PKGNAME= sdl2-${V}
-REVISION= 0
CATEGORIES= devel
MASTER_SITES= https://www.libsdl.org/release/

Index: distinfo
===================================================================
RCS file: /cvs/ports/devel/sdl2/distinfo,v
retrieving revision 1.18
diff -u -p -r1.18 distinfo
--- distinfo 19 Jul 2023 02:37:46 -0000 1.18
+++ distinfo 3 Aug 2023 05:26:21 -0000
@@ -1,2 +1,2 @@
-SHA256 (SDL2-2.28.1.tar.gz) = SXfOulwAVNvmwvEUZBrO1DzjvytB6mS2o3LWuhKcsV0=
-SIZE (SDL2-2.28.1.tar.gz) = 8109697
+SHA256 (SDL2-2.28.2.tar.gz) = ZLEQL6Igk1FbAu8z3Yc53uG6V+nbumoJKUK4u+0aHF4=
+SIZE (SDL2-2.28.2.tar.gz) = 7341117