Add Linux and macOS CI through GitHub actions

.github/workflows/build-mac.yml

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+name: build-mac
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install dependencies
+      run: |
+        brew install fftw ncurses libtool automake portaudio iniparser
+        ln -s /usr/local/bin/glibtoolize /usr/local/bin/libtoolize
+    - name: Generate configure
+      run: ./autogen.sh
+    - name: Run ./configure
+      run: LDFLAGS="-L/usr/local/opt/ncurses/lib" CPPFLAGS="-I/usr/local/opt/ncurses/include" ./configure
+    - name: Run make
+      run: make

.github/workflows/build.yml

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+name: build
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install libfftw3-dev libasound2-dev libncursesw5-dev libpulse-dev libtool automake libiniparser-dev
+    - name: Generate configure
+      run: ./autogen.sh
+    - name: Run ./configure
+      run: CPPFLAGS=-I/usr/include/iniparser ./configure
+    - name: Run make
+      run: make