RFR: 8365231: Don't build gtest with /EHsc [v2]

[Magnus Ihse Bursie]

> According to https://github.com/openjdk/jdk/pull/26661#issuecomment-3162014034, we should not build gtest with `/EHsc`. 
> 
> I can honestly say I don't fully understand the consequences of this change, but at least it passes building and testing on Oracle CI. And it does seem to make sense that we build the gtest version of libjvm as close as possible to the real version. For libgtest I just thought it was prudent to keep the flags in sync with how we build libjvm. This might not be the correct decision.
> 
> I have not tested how or if this affects the ability for gtest to handle bugs or crashes in the JVM, nor do I really have any idea about any such consequences. This PR is opened more to start a discussion than with the intention of just integrating this.

Magnus Ihse Bursie 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. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into no-gtest-ehsc
 - 8365231: Don't build gtest with /EHsc

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/26721/files
  - new: https://git.openjdk.org/jdk/pull/26721/files/69ad27ec..f2127bb3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26721&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26721&range=00-01

  Stats: 57704 lines in 1959 files changed: 33331 ins; 15569 del; 8804 mod
  Patch: https://git.openjdk.org/jdk/pull/26721.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26721/head:pull/26721

PR: https://git.openjdk.org/jdk/pull/26721