staging: Fix rare sysroot corruption issue

We've seen failures on the autobuilder in oe-selftest where things which should
be in the sysroot aren't. The exact steps to reproduce the exact failure are
elusive and probably hash equivalance dependency but this set of steps does
reproduce corruption which is probably of the same origin:

Add DISTRO_FEATURES += "systemd"

  bitbake dbus

Remove DISTRO_FEATURES += "systemd"

  bitbake dbus
  bitbake dbus -c clean
  bitbake dbus -c configure

Add DISTRO_FEATURES += "systemd"

  bitbake quilt-native
  bitbake dbus -c populate_sysroot

Remove DISTRO_FEATURES += "systemd"

  bitbake dbus -c compile

Where dbus will now fail as the compiler was no longer in the sysroot.

This works by clearing x11 and other values out of DISTRO_FEATURES so the x11
dependencies are removed from the sysroot. The configure stamp remains valid so
when the original configuration is restored, it becomes valid again but a load
of the sysroot disappeared and build failures result.

Fix this by removing stamps when we remove things from the sysroot.

Depends on a change to bitbake build.py to add the clean_stamp API.

[YOCTO #14790]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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