[jdk8u-dev] RFR: 8374948: [8u] saproc & jsig builds add duplicate linker flags on Darwin/MacOS [v2]

[Andrew John Hughes]

> This patch breaks out the Mac minimum version argument into its own variable, `MAC_FLAGS`, in `gcc.make`, so it can be added independently in `saproc.make` and `jsig.make`. This prevents duplicate linker flags and C++-only flags being added to the C build for jsig and saproc.

Andrew John Hughes has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/742/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/742/files/8d804e1f..8d804e1f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=742&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=742&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/742.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/742/head:pull/742

PR: https://git.openjdk.org/jdk8u-dev/pull/742