qemu.inc: Remove empty egg-info directories before running meson

This is the same solution that has been applied to meson.bbclass to
allow building with meson after it has been updated to a new
version. It needs to be applied here as well since qemu uses meson
without inheriting meson.bbclass.

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>