swrast: BlitFramebuffer should not be killed by conditional rendering

NOTE: This is a candidate for the 7.10 branch.

Reviewed-by: Brian Paul <brianp@vmware.com>

src/mesa/swrast/s_blit.c

@@ -568,9 +568,6 @@ _swrast_BlitFramebuffer(struct gl_context *ctx,
    };
    GLint i;
 
-   if (!_mesa_check_conditional_render(ctx))
-      return; /* don't clear */
-
    if (!ctx->DrawBuffer->_NumColorDrawBuffers)
       return;