mtools: uses x11

Closes #17796.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
vala 0.18.1

Closes #17795.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
libagg still fails with clang 425

Closes #17798.
qemu: fix configure.

Caused by #17754.

Closes #17785.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>