Remove MacOS CI builds

Homebrew has broken something and I cannot figure
out how to fix it.

Signed-off-by: Ralph Castain <rhc@pmix.org>

.github/workflows/builds.yaml

@@ -3,56 +3,6 @@ name: Build tests
 on: [pull_request]
 
 jobs:
-  macos:
-    runs-on: macos-latest
-    strategy:
-      matrix:
-        path: ['non-vpath', 'vpath']
-        sphinx: ['no-sphinx', 'sphinx']
-    steps:
-    - name: Install dependencies
-      run: brew install libevent hwloc autoconf automake libtool
-    - name: Git clone OpenPMIx
-      uses: actions/checkout@v3
-      with:
-            submodules: recursive
-            repository: openpmix/openpmix
-            path: openpmix/master
-            ref: master
-    - name: Build OpenPMIx
-      run: |
-        cd openpmix/master
-        ./autogen.pl
-        ./configure --prefix=$RUNNER_TEMP/pmixinstall
-        make -j
-        make install
-    - name: Git clone PRRTE
-      uses: actions/checkout@v3
-      with:
-            submodules: recursive
-            clean: false
-    - name: Build PRRTE
-      run: |
-        ./autogen.pl
-
-        sphinx=
-        if test "${{ matrix.sphinx }}" = sphinx; then
-            pip3 install -r docs/requirements.txt
-            sphinx=--enable-sphinx
-        fi
-
-        c=./configure
-        if test "${{ matrix.path }}" = vpath; then
-            mkdir build
-            cd build
-            c=../configure
-        fi
-
-        $c --prefix=$RUNNER_TEMP/prteinstall --with-pmix=$RUNNER_TEMP/pmixinstall $sphinx
-        make -j
-        make install
-        make uninstall
-
   ubuntu:
     runs-on: ubuntu-latest
     strategy: