[11u] RFR: 8235585: Enable macOS codesigning for all libraries and executables

[René Schünemann]

Hi,

can I please get a review for this 11u backport, code signing all
libraries and executables on macOS?

I had to resolve "make/launcher/LauncherCommon.gmk".

https://bugs.openjdk.java.net/browse/JDK-8235585
http://cr.openjdk.java.net/~rschuenemann/wr/2019/8235585-macOS_Signing-jdk11/01/
http://hg.openjdk.java.net/jdk/jdk/rev/dcf88e5c8c07

Best Regards
Rene