wined3d: Fix a syntax error in the ARB vertex program offset shader.

As some Mesa developers pointed out, the GL_ARB_vertex_program grammar
does not allow an immediate value as source argument in ARL. Most
compilers accept it, but since it is not the purpose of the test
program to test for this replace it with a proper constant.

dlls/wined3d/directx.c

@@ -426,7 +426,8 @@ static inline BOOL test_arb_vs_offset_limit(WineD3D_GL_Info *gl_info) {
         "!!ARBvp1.0\n"
         "PARAM C[66] = { program.env[0..65] };\n"
         "ADDRESS A0;"
-        "ARL A0.x, 0.0;\n"
+        "PARAM zero = {0.0, 0.0, 0.0, 0.0};\n"
+        "ARL A0.x, zero.x;\n"
         "MOV result.position, C[A0.x + 65];\n"
         "END\n";