CI: switch Arch and FreeBSD to wlroots 0.18

Also add wlroots0.18-devel to Void, assuming that is what the
package will be called once available. For previous packaging
see https://github.com/void-linux/void-packages/pull/48323/files

.github/workflows/build.yml

@@ -39,7 +39,6 @@ jobs:
             container: archlinux:base-devel
             env:
               TARGET: 'sh -xe'
-              PKG_CONFIG_PATH: '/usr/lib/wlroots0.17/pkgconfig'
 
           - name: Debian
             os: ubuntu-latest
@@ -70,7 +69,7 @@ jobs:
         run: |
           pacman-key --init
           pacman -Syu --noconfirm
-          pacman -S --noconfirm git meson clang wlroots0.17 libdrm libinput \
+          pacman -S --noconfirm git meson clang wlroots libdrm libinput \
             wayland-protocols cairo pango libxml2 xorg-xwayland librsvg \
             libdisplay-info
 
@@ -92,7 +91,7 @@ jobs:
             sed -i '' 's/quarterly/latest/' /etc/pkg/FreeBSD.conf
             pkg set -yn pkg:mesa-dri # hack to skip llvm dependency
             pkg install -y git meson gcc pkgconf cairo pango evdev-proto \
-              hwdata wayland-protocols wlroots017 libdisplay-info
+              hwdata wayland-protocols wlroots libdisplay-info
           run: echo "setup done"
 
       - name: Install Void Linux dependencies
@@ -106,7 +105,7 @@ jobs:
           xbps-install -Syu
           xbps-install -y git meson gcc clang pkg-config scdoc \
             cairo-devel glib-devel libpng-devel librsvg-devel libxml2-devel \
-            pango-devel wlroots0.17-devel gdb bash xorg-server-xwayland \
+            pango-devel wlroots0.18-devel gdb bash xorg-server-xwayland \
             dejavu-fonts-ttf
 
       # These build are executed on all runners