RFR: JDK-8257633: Missing -mmacosx-version-min=X flag when linking libjvm

[Erik Joelsson]

We have historically provided -mmacosx-version-min=10.9.0 flags when compiling and linking all our native executables and libraries on Macosx. That flag seems to have disappeared when linking libjvm. This is sometimes causing our macosx builds to not be able to run on older versions of macosx.

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Commit messages:
 - Add -macosx-version-min to libjvm ldflags

Changes: https://git.openjdk.java.net/jdk/pull/1623/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1623&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257633
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1623.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1623/head:pull/1623

PR: https://git.openjdk.java.net/jdk/pull/1623