mesa: add EXT_dsa glGetVertexArray* 4 functions

The implementation doesn't share much with get.c because:
  * the refactoring needed for get.c to not depend on ctx->Array.VAO would
    be quite large
  * glGetVertexArray* would still need to filter pname to only accept the one
    specified by the spec
  * these functions are getter, the implementation is trivial (the complexity
    is in the correct filtering of pname input)

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/mapi/glapi/gen/EXT_direct_state_access.xml

@@ -1170,6 +1170,32 @@
       <param name="index" type="GLuint" />
    </function>
 
+   <function name="GetVertexArrayIntegervEXT">
+      <param name="vaobj" type="GLuint" />
+      <param name="pname" type="GLenum" />
+      <param name="param" type="GLint*" />
+   </function>
+
+   <function name="GetVertexArrayPointervEXT">
+      <param name="vaobj" type="GLuint" />
+      <param name="pname" type="GLenum" />
+      <param name="param" type="GLvoid**" />
+   </function>
+
+   <function name="GetVertexArrayIntegeri_vEXT">
+      <param name="vaobj" type="GLuint" />
+      <param name="index" type="GLuint" />
+      <param name="pname" type="GLenum" />
+      <param name="param" type="GLint*" />
+   </function>
+
+   <function name="GetVertexArrayPointeri_vEXT">
+      <param name="vaobj" type="GLuint" />
+      <param name="index" type="GLuint" />
+      <param name="pname" type="GLenum" />
+      <param name="param" type="GLvoid**" />
+   </function>
+
    <!-- ARB_vertex_program -->
    <function name="NamedProgramStringEXT">
       <param name="program" type="GLuint" />

src/mapi/glapi/gen/static_data.py

@@ -1612,6 +1612,10 @@ offsets = {
     "DisableVertexArrayEXT": 1576,
     "EnableVertexArrayAttribEXT": 1577,
     "DisableVertexArrayAttribEXT": 1578,
+    "GetVertexArrayIntegervEXT": 1579,
+    "GetVertexArrayPointervEXT": 1580,
+    "GetVertexArrayIntegeri_vEXT": 1581,
+    "GetVertexArrayPointeri_vEXT": 1582
 }
 
 functions = [