build: move mingw jobs to Github actions

.github/workflows/build.yml

@@ -0,0 +1,41 @@
+name: build
+
+on:
+  push:
+    branches:
+      - master
+      - ci
+      - 'release/**'
+  pull_request:
+    branches: [master]
+
+jobs:
+  mingw:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        target: [i686-w64-mingw32, x86_64-w64-mingw32]
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/cache@v2
+        with:
+          path: mingw_prefix/
+          key: ${{ matrix.target }}
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y autoconf automake pkg-config g++-mingw-w64 gcc-multilib nasm yasm
+          ./bootstrap.py
+
+      - name: Build
+        run: |
+          ./ci/build-mingw64.sh
+        env:
+          TARGET: ${{ matrix.target }}
+
+      - name: Print configure log
+        if: ${{ failure() }}
+        run: |
+          cat ./build/config.log

.travis.yml

@@ -14,23 +14,6 @@ _macbase:
         - $HOME/Library/Caches/Homebrew
         - /usr/local/Homebrew
 
-_mingwbase:
-  - &mingw
-    os: linux
-    addons:
-      apt:
-        packages:
-          - 'autoconf'
-          - 'automake'
-          - 'pkg-config'
-          - 'gcc-mingw-w64'
-          - 'gcc-multilib'
-          - 'nasm'
-          - 'yasm'
-    cache:
-      directories:
-        - mingw_prefix/
-
 matrix:
   include:
     - <<: *mac
@@ -51,10 +34,6 @@ matrix:
     - os: linux
       compiler: clang
       env: CONTAINER=registry.cirno.systems/kiwi/containers/mpv-ci:stable-deps CI_SCRIPT=ci/build-tumbleweed.sh
-    - <<: *mingw
-      env: CI_SCRIPT=ci/build-mingw64.sh TARGET=i686-w64-mingw32
-    - <<: *mingw
-      env: CI_SCRIPT=ci/build-mingw64.sh TARGET=x86_64-w64-mingw32
   allow_failures:
     - os: osx
       osx_image: xcode9.4