Add comments about PATH on macOS (#821)

product/buildSrc/src/main/java/com/chaquo/python/internal/Common.java

@@ -121,6 +121,10 @@ public static String findExecutable(String name) throws FileNotFoundException {
         // /usr/local/bin instead. This directory may also appear to be on the default
         // PATH, but this is because it's listed in /etc/paths, which only affects
         // shells, but not other apps like Android Studio and its Gradle subprocesses.
+        //
+        // As of Gradle 6.9, this appears to be unnecessary (#821). So once the
+        // `product` project is using a newer version than that, we can remove this
+        // method and let Gradle find executables itself.
         List<String> path = new ArrayList<>();
         String osName = System.getProperty("os.name").toLowerCase();
         if (osName.startsWith("mac")) {

product/gradle/wrapper/gradle-wrapper.properties

@@ -12,4 +12,6 @@ zipStorePath=wrapper/dists
 # https://discuss.gradle.org/t/my-plugin-cant-be-applied-when-plugin-is-built-with-gradle-7-1-1/40464).
 # So don't change it until Gradle 6 is below our minimum requirement -- in fact, so far
 # below that it isn't even being tested by AndroidPlugin.test_old.
+#
+# Once this is upgraded to 6.9 or later, Common.findExecutable can be removed.
 distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip