Update macOS UB1 to SDL 2.0.22

Fix crash when scrolling using touchpad on macOS 10.6 (I fixed it
in SDL 2.0.18) and fix failing to start on x86 due to ioq3 SDL dylib
having absolute path instead of "@executable_path/libSDL2-2.0.0.dylib".

SDL 2.24.0 removed macOS 10.6 support (last with x86). Offically at
least, they also dropped x86_64 on macOS 10.7 and 10.8. So ioq3 UB1
is limited to SDL 2.0.22.

- Update x86 and x86_64 to SDL 2.0.22. Compiled with 10.13 SDK as
  10.14 SDK dropped running on older than macOS 10.9 and I ran
  "strip -x" on the libraries. Ad-hoc signed with PyOxidizer rcodesign.
- PPC is still MAN-AT-ARMS' SDL 2.0.1 build but I ran "strip -x"
  on it to reduce the file size.
- ARM64 build was removed from UB1 as UB2 with SDL 2.24.0 should
  be used instead.

Makefile

@@ -589,11 +589,22 @@ ifeq ($(PLATFORM),darwin)
       BASE_CFLAGS += -I$(SDLHDIR)/include
     else
       # Universal Binary - for running on Mac OS X 10.5 or later
+      # ppc (10.5/10.6), x86 (10.6 or later), x86_64 (10.6 or later)
+      #
+      # x86/x86_64 on 10.5 will run the ppc build.
+      #
+      # SDL 2.0.1,  last with Mac OS X PowerPC
+      # SDL 2.0.4,  last with Mac OS X 10.5 (x86/x86_64)
+      # SDL 2.0.22, last with Mac OS X 10.6 (x86/x86_64)
+      #
+      # code/libs/macosx-ub/libSDL2-2.0.0.dylib contents
+      # - ppc build is SDL 2.0.1 with a header change so it compiles
+      # - x86/x86_64 build are SDL 2.0.22
       MACLIBSDIR=$(LIBSDIR)/macosx-ub
       ifneq ($(findstring $(ARCH),ppc ppc64),)
         BASE_CFLAGS += -I$(SDLHDIR)/include-macppc
       else
-        BASE_CFLAGS += -I$(SDLHDIR)/include-2.0.16
+        BASE_CFLAGS += -I$(SDLHDIR)/include-2.0.22
       endif
     endif