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='2023-07-23 02:00:00 +0200'>2023-07-23</span></td><td><a href='/guix/commit/gnu/packages/haskell-xyz.scm?id=1d0d2a8ec9186d250405dce03a4cbe8809beb0f1'>gnu: Add ghc-vty.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-xyz.scm (ghc-vty): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-07-23 02:00:00 +0200'>2023-07-23</span></td><td><a href='/guix/commit/gnu/packages/haskell-xyz.scm?id=08ae5d53e8dd79cec9df2cdfe382618f22fad48f'>gnu: Add ghc-irc-core.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-xyz.scm (ghc-irc-core): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-07-23 02:00:00 +0200'>2023-07-23</span></td><td><a href='/guix/commit/gnu/packages/haskell-xyz.scm?id=a4706eef32d6d79dd3f9b2b457410c06e4f63633'>gnu: Add ghc-hookup.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-xyz.scm (ghc-hookup): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-07-23 02:00:00 +0200'>2023-07-23</span></td><td><a href='/guix/commit/gnu/packages/haskell-xyz.scm?id=cb05df4bca8e636e46e8a6f085592711e4e337ba'>gnu: Add ghc-config-schema.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-xyz.scm (ghc-config-schema): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-07-23 02:00:00 +0200'>2023-07-23</span></td><td><a href='/guix/commit/gnu/packages/haskell-xyz.scm?id=b5b1dc96eb9356e708e284640ae400e7069b9a99'>gnu: Add ghc-config-value.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-xyz.scm (ghc-config-value): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-07-09 02:00:17 +0200'>2023-07-09</span></td><td><a href='/guix/commit/gnu/packages/haskell-xyz.scm?id=00ed2901f5171e4f9435641a91678217cae38030'>gnu: cabal-install, ghc-cabal-syntax: Use HTTPS home page.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-apps.scm (cabal-install)[home-page]: Use HTTPS.
* gnu/packages/haskell-xyz.scm (ghc-cabal-syntax)[home-page]: Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>