Add a missing GL_EXTCALL macro

[Dmitry Timoshkov]

Hello,

Changelog:
    Add a missing GL_EXTCALL macro.

--- cvs/hq/wine/dlls/wined3d/glsl_shader.c	2006-09-26 15:23:06.000000000 +0900
+++ wine/dlls/wined3d/glsl_shader.c	2006-09-26 16:21:38.000000000 +0900
@@ -319,7 +319,7 @@ void shader_glsl_load_constants(
         /* Upload the position fixup params */
         pos = GL_EXTCALL(glGetUniformLocationARB(programId, "posFixup"));
         checkGLcall("glGetUniformLocationARB");
-        glUniform4fvARB(pos, 1, &vshader_impl->wineD3DDevice->posFixup[0]);
+        GL_EXTCALL(glUniform4fvARB(pos, 1, &vshader_impl->wineD3DDevice->posFixup[0]));
         checkGLcall("glUniform4fvARB");
     }