RFR: 8295990: Improve setting of strip flags in make

[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.

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Commit messages:
 - Merge branch 'openjdk:master' into patch-1
 - Add more documentation
 - Replace with the actual new check
 - Little documentation doesn't hurt
 - Prepare for actual changes
 - Update flags-other.m4
 - This is getting annoying
 - -V doesn't work with MacOS strip
 - Get output from strip to search for useful information
 - Update flags-other.m4
 - ... and 2 more: https://git.openjdk.org/jdk/compare/823fd4a9...e572f95f

Changes: https://git.openjdk.org/jdk/pull/10882/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10882&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295990
  Stats: 27 lines in 2 files changed: 19 ins; 2 del; 6 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