SVN r351457 breaks drm-current

[Michael Butler]

As follows ..

Building
/usr/obj/usr/src/amd64.amd64/sys/TOSHI/modules/usr/local/sys/modules/drm-current-kmod/linuxkpi/linux_compat.o
--- linux_compat.o ---
In file included from
/usr/local/sys/modules/drm-current-kmod/linuxkpi/gplv2/src/linux_compat.c:5:
./machine/md_var.h:61:34: error: declaration of 'struct pcpu' will not
be visible outside of this function [-Werror,-Wvisibility]
void    amd64_bsp_pcpu_init1(struct pcpu *pc);
                                    ^
./machine/md_var.h:63:32: error: declaration of 'struct pcpu' will not
be visible outside of this function [-Werror,-Wvisibility]
void    amd64_bsp_ist_init(struct pcpu *pc);
                                  ^

	imb