bootstrap/cc: Turn off -Wconversion
bootstrap/cc: Turn off -Wconversion

Can be too verbose, as in:

	u8 u8_operator_add__(const u8 *a, const u8 *b) {
	  return *a + *b;
	}

generates a warning saying that converting an int to u8 can loose
information.

nanocritical/n,nanocritical/n,nanocritical/n,nanocritical/n