Fix for macOS startup without Oracle JDK 8

Fixes eXist-db#2695 for develop-4.x.x systems.

Author: joewiz

build/scripts/macosx.xml

@@ -17,7 +17,7 @@
     <property name="app.resources" value="${app.dir}/Contents/Resources"/>
     <property name="app.exist" value="${app.resources}/eXist-db"/>
     <property name="app.icon" value="installer/scripts/icon.icns"/>
-    <property name="appbundler.jar" value="${tools.appbundler}/lib/appbundler-20181006.jar"/>
+    <property name="appbundler.jar" value="${tools.appbundler}/lib/appbundler-20190531.jar"/>
 
     <condition property="isMacOS">
         <and>

tools/appbundler/README.md

@@ -1,5 +1,5 @@
-This version of appbundler is taken from https://bitbucket.org/infinitekind/appbundler (rev. dcd72b3). This project fixes a number of issues with the original appbundler, https://java.net/projects/appbundler.
+This version of appbundler is taken from https://github.com/TheInfiniteKind/appbundler (rev. b42e147). This project fixes a number of issues with the original appbundler, https://java.net/projects/appbundler.
 
-Infinitekind only provides source code for appbundler, no releases, so the eXist-db project has to create its own build.
+TheInfiniteKind only provides source code for appbundler, no releases, so the eXist-db project has to create its own build.
 
-The current binary `lib/appbuilder-20181006.jar` was built by Joe Wicentowski on Oct. 6, 2018 using rev. dcd72b3, Oracle JDK 1.8.0_181-b13, and xcrun version 43 on macOS 10.14. (The xcrun tool and all that is needed to compile appbuilder is included the Xcode Command Line Tools, which can be installed via `xcode-select --install`; a full installation of Xcode is not necessary.)
+The current binary `lib/appbundler-20190531.jar` was built by Joe Wicentowski on May 31, 2019 using rev. b42e147, Oracle JDK 1.8.0_211-b12, and xcrun version 43 on macOS 10.13. (The xcrun tool and all that is needed to compile appbuilder is included the Xcode Command Line Tools, which can be installed via `xcode-select --install`; a full installation of Xcode is not necessary.)