wined3d: recognize DRI R300 drivers as Mesa

[Austin English]

-- 
-Austin
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diff --git a/dlls/wined3d/directx.c b/dlls/wined3d/directx.c
index 7b46c0f..e9e64c7 100644
--- a/dlls/wined3d/directx.c
+++ b/dlls/wined3d/directx.c
@@ -988,6 +988,7 @@ static GL_Vendors wined3d_guess_vendor(const char *gl_vendor, const char *gl_ren
         return VENDOR_INTEL;
 
     if (strstr(gl_vendor, "Mesa")
+            || strstr(gl_vendor, "DRI R300 Project")
             || strstr(gl_vendor, "Tungsten Graphics, Inc"))
         return VENDOR_MESA;