Remove inadvertent use of `GLvoid` in command definition (#682)

xml/gl.xml

diff --git a/xml/gl.xml b/xml/gl.xml
index 326bdda..902d7aa 100644
--- a/xml/gl.xml
+++ b/xml/gl.xml
@@ -7242,7 +7242,7 @@
         </command>
         <command>
             <proto>void <name>glAddClientPointerRangeMESA</name></proto>
-            <param><ptype>GLvoid</ptype> *<name>addr</name></param>
+            <param>void *<name>addr</name></param>
             <param><ptype>GLsizeiptr</ptype> <name>size</name></param>
         </command>
         <command>