Remove unnecessary steps, replace brew with conda

Author: rhpvorderman

.github/workflows/ci.yml

@@ -62,7 +62,7 @@ jobs:
         run: sudo apt install yasm
         if: runner.os == 'Linux'
       - name: Install build dependencies (Macos)
-        run: brew install yasm automake autoconf
+        run: conda install yasm automake autoconf
         if: runner.os == 'macOS'
       - name: Install twine, cython wheel and upgrade setuptools
         run: pip install --upgrade twine cython wheel setuptools
@@ -99,7 +99,7 @@ jobs:
         run: sudo apt install yasm
         if: runner.os == 'Linux'
       - name: Install build dependencies (Macos)
-        run: brew install yasm automake autoconf
+        run: conda install yasm automake autoconf
         if: runner.os == 'macOS'
       - name: Run tests
         run: tox -e py3
@@ -144,12 +144,6 @@ jobs:
           submodules: recursive
       - uses: actions/setup-python@v2
         name: Install Python
-      - name: Install build dependencies (Linux)  # Yasm in pypa/manylinux images.
-        run: sudo apt install yasm
-        if: runner.os == 'Linux'
-      - name: Install build dependencies (Macos)
-        run: brew install yasm automake autoconf
-        if: runner.os == 'macOS'
       - name: Install cibuildwheel
         run: python -m pip install cibuildwheel==1.8.0
         env: