Add clang-format lint step to CI

Also condense build-mac.yml and build.yml into one file, so we can have
a single action reporting the status of the entire project.

.github/workflows/build-mac.yml

@@ -1,17 +0,0 @@
-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

@@ -1,7 +1,12 @@
 name: build
 on: [push, pull_request]
 jobs:
-  build:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: DoozyX/clang-format-lint-action@v0.5
+  build-linux:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
@@ -15,3 +20,17 @@ jobs:
       run: CPPFLAGS=-I/usr/include/iniparser ./configure
     - name: Run make
       run: make
+  build-macos:
+    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