xbps wants to be updated before any other packages are installed

[avdgrinten]

Installing packages fails while xbps is outdated in the sysroot:

xbstrap: install libdrm-headers [1/95]
xbstrap: Running ['xbps-remove', '-Fy', '-r', '/home/qookie/projects/managarm/build-arm/system-root', 'libdrm-headers']
xbstrap: Running ['xbps-install', '-fyU', '-r', '/home/qookie/projects/managarm/build-arm/system-root', '--repository', '/home/qookie/projects/managarm/build-arm/xbps-repo', 'libdrm-headers']
The 'xbps' package must be updated, please run `xbps-install -u xbps`
xbstrap: Action install of package libdrm-headers failed

Reported by @qookei.