build: require at least wlroots 0.17.1

There are enough bugs fixed in 0.17.1 which are relevant to river that I
think it's worthwhile to refuse to compile against 0.17.1.

.builds/alpine.yml

@@ -34,7 +34,7 @@ tasks:
       cd ..
 
       cd wlroots
-      git checkout 0.17.0
+      git checkout 0.17.1
       meson setup build --auto-features=enabled -Drenderers=gles2 -Dexamples=false \
             -Dwerror=false -Db_ndebug=false -Dxcb-errors=disabled --prefix /usr
       sudo ninja -C build/ install

.builds/archlinux.yml

@@ -32,7 +32,7 @@ tasks:
       cd ..
 
       cd wlroots
-      git checkout 0.17.0
+      git checkout 0.17.1
       meson setup build --auto-features=enabled -Drenderers=gles2 -Dexamples=false \
             -Dwerror=false -Db_ndebug=false --prefix /usr
       sudo ninja -C build/ install

.builds/freebsd.yml

@@ -36,7 +36,7 @@ tasks:
       cd ..
 
       cd wlroots
-      git checkout 0.17.0
+      git checkout 0.17.1
       meson setup build --auto-features=enabled -Drenderers=gles2 -Dexamples=false \
             -Dwerror=false -Db_ndebug=false --prefix /usr
       sudo ninja -C build/ install