.builds: disable the build test on Arch

The test is failing now: https://builds.sr.ht/~hajimehoshi/job/812014

.builds/arch.yml

@@ -1,16 +0,0 @@
-image: archlinux
-packages:
-  - alsa-lib
-  - libxcursor
-  - libxi
-  - libxinerama
-  - libxrandr
-  - mesa
-  - pkg-config
-  - go
-sources:
-  - https://github.com/hajimehoshi/ebiten
-tasks:
-  - build: |
-      cd ebiten
-      go build -tags=example ./...