[ci] Add boost/eigen installation to CI

Author: aaronj0

.github/workflows/ci.yml

@@ -352,6 +352,8 @@ jobs:
           brew link --overwrite "$pkg"
         done
         brew upgrade
+        brew install eigen
+        brew install boost
         pip install distro pytest
 
     - name: Restore Cache LLVM/Clang runtime build directory

test/test_eigen.py

@@ -1,6 +1,6 @@
 import py, os, sys
 from pytest import mark, raises
-from .support import setup_make, IS_CLANG_REPL
+from .support import setup_make, IS_CLANG_REPL, IS_MAC_X86
 
 inc_paths = [os.path.join(os.path.sep, 'usr', 'include'),
              os.path.join(os.path.sep, 'usr', 'local', 'include')]