New package: mangowc-0.10.9

[dogknowsnx]

Closes #57731

Testing the changes

• I tested the changes in this PR: YES
• I'm not using any display manager, so cannot test startup from there
• Haven't had any issues after a couple weeks of testing - it's a rather smooth experience

New package

• This new package conforms to the package requirements: YES

Local build testing

• I built this PR locally for my native architecture, x86_64-glibc

Notes

• Not sure whether GPL-3.0-or-later would suffice, see also License clarification DreamMaoMao/mangowc#127 EDIT: After having a look at https://spdx.github.io/spdx-spec/v3.0.1/annexes/spdx-license-expressions/ I've opted for the AND expression:

simultaneously comply with two or more licenses

• Added build option for xwayland, defaulting to "OFF" (I'm not using xwayland myself) - the window manager is working fine w/o xwayland present, and one could simply install xorg-server-xwayland since it is optional according to upstream.
• Converting to draft fttb