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
 
 type='hidden' name='id' value='f7aa0734518f18680a1fe4d54af221a45002475b'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=f7aa0734518f18680a1fe4d54af221a45002475b'>refs</a><a class='active' href='/guix/log/etc/snippets'>log</a><a href='/guix/tree/etc/snippets?id=f7aa0734518f18680a1fe4d54af221a45002475b'>tree</a><a href='/guix/commit/etc/snippets?id=f7aa0734518f18680a1fe4d54af221a45002475b'>commit</a><a href='/guix/diff/etc/snippets?id=f7aa0734518f18680a1fe4d54af221a45002475b'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/snippets'>
<input type='hidden' name='id' value='f7aa0734518f18680a1fe4d54af221a45002475b'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=f7aa0734518f18680a1fe4d54af221a45002475b'>root</a>/<a href='/guix/log/etc?id=f7aa0734518f18680a1fe4d54af221a45002475b'>etc</a>/<a href='/guix/log/etc/snippets?id=f7aa0734518f18680a1fe4d54af221a45002475b'>snippets</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/snippets?id=f7aa0734518f18680a1fe4d54af221a45002475b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-23 17:30:14 +0100'>2020-12-23</span></td><td><a href='/guix/commit/etc/snippets?id=d6b0d219c6e4e8392fbeb3263c95e9b7d7c75e1c'>etc: snippets: Add new build systems to package snippet.</a><span class='msg-avail'>...</span></td><td>Morgan Smith</td></tr>
<tr><td><span title='2020-12-04 18:19:39 +0100'>2020-12-04</span></td><td><a href='/guix/commit/etc/snippets?id=39e8bc2ab8f755e05050f2dcbf07143e724d22ed'>etc: snippets: Fix name extraction.</a><span class='msg-avail'>...</span></td><td>Nicolas Goaziou</td></tr>
<tr><td><span title='2020-12-04 17:09:38 +0100'>2020-12-04</span></td><td><a href='/guix/commit/etc/snippets?id=988a49c78ef19ad25cef543e2059a19db04bbd36'>etc: snippets: Fix name extraction.</a><span class='msg-avail'>...</span></td><td>Nicolas Goaziou</td></tr>
<tr><td><span title='2020-11-25 10:45:42 +0100'>2020-11-25</span></td><td><a href='/guix/commit/etc/snippets?id=402f1104e58b8e76d42689770d0c6b106afaffc8'>etc: snippets: Fix "gnu: Add ..." name when prefilling Common Lisp commits me...</a><span class='msg-avail'>...</span></td><td>Pierre Neidhardt</td></tr>
<tr><td><span title='2020-11-23 11:14:22 +0100'>2020-11-23</span></td><td><a href='/guix/commit/etc/snippets?id=add47499170222f1d449a9a63444e01f115805ff'>etc: snippets: Prefill Common Lisp package names.</a><span class='msg-avail'>...</span></td><td>Pierre Neidhardt</td></tr>
<tr><td><span title='2020-11-23 11:13:58 +0100'>2020-11-23</span></td><td><a href='/guix/commit/etc/snippets?id=8307b8f184d59f69b66292ae1137997caa50cb15'>etc: snippets: Fix package name extraction.</a><span class='msg-avail'>...</span></td><td>Pierre Neidhardt</td></tr>