Switch to ubuntu/bionic build on Travis CI

It's faster and more reliable than previous docker + alpine solution.

.travis.yml

@@ -1,14 +1,17 @@
-dist: xenial
+os: linux 
+arch: arm64 
+dist: bionic
 language: minimal
 
-env:
-  DOCKER_IMAGE: francma/wob-travis-ci
-  DOCKER_CWD: /wob
-  BUILD_DIR: build
-
-services:
-  - docker
+addons:
+  apt:
+    packages:
+      - meson
+      - wayland-protocols
+      - ninja-build
+      - libwayland-dev
 
 script:
-  - docker run -v "$PWD":"$DOCKER_CWD" -w "$DOCKER_CWD" "$DOCKER_IMAGE" /usr/bin/meson "$BUILD_DIR" --buildtype release
-  - docker run -v "$PWD":"$DOCKER_CWD" -w "$DOCKER_CWD" "$DOCKER_IMAGE" /usr/bin/ninja -C "$BUILD_DIR"
+  - meson build
+  - ninja -C build
+  - meson test -C build

meson.build

@@ -9,7 +9,7 @@ project(
 cc = meson.get_compiler('c')
 
 wlr_protocol_dir = meson.source_root() + '/wlr-protocols'
-wayland_protos = dependency('wayland-protocols', version: '>=1.14')
+wayland_protos = dependency('wayland-protocols', version: '>=1.13')
 wl_protocol_dir = wayland_protos.get_pkgconfig_variable('pkgdatadir')
 wayland_scanner = find_program('wayland-scanner')
 wayland_client = dependency('wayland-client')