[11u] 8264848 backport: [macos] libjvm.dylib linker warning due to macOS version mismatch

[Schmidt, Lutz]

Hi, 

I need a sponsor to bring the fix to jdk11u-dev. Would someone volunteer, please?

The patch applied cleanly to jdk11u-dev and the downport was approved.

Original Bug:    https://bugs.openjdk.java.net/browse/JDK-8264848 
Downport webrev: https://cr.openjdk.java.net/~lucy/webrevs/8264848.11u.01/  

Thank you!
Lutz