RFR: 8295990: Improve make handling of strip flags [v4]

[Julian Waters]

> Strip currently has its flags set by guessing based on the OS, it would be more appropriate to instead set them based on properly checking the strip binary instead of speculating what the correct flags are based on the compiler and OS.

Julian Waters has updated the pull request incrementally with one additional commit since the last revision:

  Comment can be made more accurate

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10882/files
  - new: https://git.openjdk.org/jdk/pull/10882/files/a940c741..d831ca59

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10882&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10882&range=02-03

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10882.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10882/head:pull/10882

PR: https://git.openjdk.org/jdk/pull/10882