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='2020-04-28 22:54:36 +0100'>2020-04-28</span></td><td><a href='/guix/commit/gnu/packages/bdw-gc.scm?id=709ca6c9824e4bbb0d81959b885248294fb062ae'>gnu: libgc/static-libs: Mark it as hidden.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
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<tr><td><span title='2020-03-02 23:39:44 +0100'>2020-03-02</span></td><td><a href='/guix/commit/gnu/packages/bdw-gc.scm?id=1f8838d1f6295e10851b2915dc3b0a97b3bbc236'>gnu: libgc: Fix replacement inheritance.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-03-01 20:47:54 +0100'>2020-03-01</span></td><td><a href='/guix/commit/gnu/packages/bdw-gc.scm?id=f4eee79db28109e751fbcf8c32b7228cbf666a43'>gnu: libgc: Use HTTPS home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-01-31 17:06:15 +0100'>2020-01-31</span></td><td><a href='/guix/commit/gnu/packages/bdw-gc.scm?id=69961ac3b9db2dbb99abb5c45ff6be3a9c01b5de'>gnu: libgc: Add version 8.0.4.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>