Continue to allocate the legacy texture pool by default.

This is a partial revert of 7358642e64

If we don't allocate it now, when the DRM version is too low there won't be any
memory allocated and DRI will fail.  Instead, waste the memory in the i915tex
case for now, and leave fixing it right (check DRM version up front and decide
which memory manager to set up) to later.

src/i830_driver.c

@@ -1234,14 +1234,13 @@ I830PreInit(ScrnInfoPtr pScrn, int flags)
       pI830->mmModeFlags = 0;
 
       if (!pI830->directRenderingDisabled) {
+	 pI830->mmModeFlags = I830_KERNEL_TEX;
 #ifdef XF86DRI_MM
 	 Bool tmp = FALSE;
 
 	 if (!IS_I965G(pI830))
 	    pI830->mmModeFlags |= I830_KERNEL_MM;
-	 else
 #endif
-	    pI830->mmModeFlags |= I830_KERNEL_TEX;
 
 	 from = X_PROBED;