Build failure ume64 on Linux rev 32220:

Compiling src/mess/drivers/besta.c...
Compiling src/mess/drivers/br8641.c...
src/mess/drivers/besta.c: In member function virtual void besta_state::machine_reset():
src/mess/drivers/besta.c:123:44: error: memset used with constant zero length parameter; this could be due to transposed parameters [-Werror=memset-transposed-args]
memset(m_mpcc_regs, sizeof(m_mpcc_regs), 0); // should initialize to defined values
^
Compiling src/mess/drivers/busicom.c...
cc1plus: all warnings being treated as errors
Compiling src/mess/video/busicom.c...
makefile:922: recipe for target 'obj/sdl64/mess/drivers/besta.o' failed
make: *** [obj/sdl64/mess/drivers/besta.o] Error 1