Update _XData32 declaration in SDL_x11sym.h to match that of libx11 1.6.

--- SDL-1.2.15/src/video/x11/SDL_x11sym.h.~1~	2012-01-19 01:30:06.000000000 -0500
+++ SDL-1.2.15/src/video/x11/SDL_x11sym.h	2014-12-26 00:22:36.445067694 -0500
@@ -165,7 +165,7 @@
  */
 #ifdef LONG64
 SDL_X11_MODULE(IO_32BIT)
-SDL_X11_SYM(int,_XData32,(Display *dpy,register long *data,unsigned len),(dpy,data,len),return)
+SDL_X11_SYM(int,_XData32,(Display *dpy,register _Xconst long *data,unsigned len),(dpy,data,len),return)
 SDL_X11_SYM(void,_XRead32,(Display *dpy,register long *data,long len),(dpy,data,len),)
 #endif
 
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<tr><td><span title='2021-06-23 23:35:27 +0200'>2021-06-23</span></td><td><a href='/guix/commit/build-aux/compile-all.scm?id=ef82ba9dd94369926eb13325d5e7da4306d23dd7'>build: Makefile splits Scheme compilation in four steps.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/48963&gt;.
Reported by Julien Lepiller &lt;julien@lepiller.eu&gt;.

This reduces peak memory consumption to something less unreasonable.

* Makefile.am (make-go): Depend on 'make-*-go' targets; remove body.
(guile-compilation-rule): New function.
(MODULES_CORE, MODULES_PACKAGES, MODULES_SYSTEM, MODULES_CLI): New
variables.
&lt;top level&gt;: Call 'guile-compilation-rule' 4 times.
* build-aux/compile-all.scm &lt;top level&gt;: Expect "--total" and
"--processed".  Take them into account when displaying progress
reports.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-06-18 14:18:06 +0200'>2021-06-18</span></td><td><a href='/guix/commit/build-aux/compile-all.scm?id=003728cfab907be5df1411c5faaf466a2b8d5ba2'>build: Remove Guile 2.2 workaround.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/compile-all.scm &lt;top level&gt;: Remove Guile 2.2 workaround.
</span></span></td><td>Ludovic Courtès</td></tr>
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