[11u] RFR: 8257633: Missing -mmacosx-version-min=X flag when linking libjvm

[Doerr, Martin]

Hi,

JDK-8257633 is backported to 11.0.11-oracle. I'd like to backport it for parity.
Change doesn't apply cleanly because of an unrelated context change in the neighboring code.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8257633

Original change:
https://git.openjdk.java.net/jdk/commit/51d325e6

11u backport:
http://cr.openjdk.java.net/~mdoerr/8257633_build_11u/webrev.00/

Please review.

Best regards,
Martin