Building --disable-verbose-mode --disable-asserts --disable-tests
	cuts the library from 112K to 45K or so

	* configure.in: check for varargs macro support,
	add --enable-verbose-mode, --enable-asserts.

	* dbus/dbus-internals.h (_dbus_assert): support
	DBUS_DISABLE_ASSERT
	(_dbus_verbose): support DBUS_ENABLE_VERBOSE_MODE