Correct the lookup of libfribidi on x86 macOS installs.

.github/workflows/wheels-test.sh

@@ -7,21 +7,18 @@ if [[ "$OSTYPE" == "darwin"* ]]; then
     # However, we *do* need Homebrew to provide a copy of fribidi for
     # testing purposes so that we can verify the fribidi shim works as expected.
     if [[ "$(uname -m)" == "x86_64" ]]; then
-        # Use the "installed" location, rather than /usr/local, for two reasons:
-        # firstly, Homebrew allows libraries to be *installed*, but not linked;
-        # and secondly, we don't want any *other* leakage from /usr/local.
-        HOMEBREW_HOME=/usr/local/Homebrew
+        HOMEBREW_PREFIX=/usr/local
     else
-        HOMEBREW_HOME=/opt/homebrew
+        HOMEBREW_PREFIX=/opt/homebrew
     fi
-    $HOMEBREW_HOME/bin/brew install fribidi
+    $HOMEBREW_PREFIX/bin/brew install fribidi
 
     # Add the lib folder for fribidi so that the vendored library can be found.
-    # Don't use /opt/homebrew/lib directly - use the lib folder where the
+    # Don't use $HOMEWBREW_PREFIX/lib directly - use the lib folder where the
     # installed copy of fribidi is cellared. This ensures we don't pick up the
     # Homebrew version of any other library that we're dependent on (most notably,
     # freetype).
-    export DYLD_LIBRARY_PATH=$(dirname $(realpath $HOMEBREW_HOME/lib/libfribidi.dylib))
+    export DYLD_LIBRARY_PATH=$(dirname $(realpath $HOMEBREW_PREFIX/lib/libfribidi.dylib))
 elif [ "${AUDITWHEEL_POLICY::9}" == "musllinux" ]; then
     apk add curl fribidi
 else