RFR: 8349781: make test TEST=gtest fails on WSL

[Erik Joelsson]

On Tue, 11 Feb 2025 07:46:54 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> `make test TEST=gtest` fails to run gtest on WSL. This is because we're looking for a nonexistent file `gtestLauncher`; on Windows the file is named `gtestLauncher.exe`.
> 
> This PR adds `$EXECUTABLE_SUFFIX` to the executable path, similar to what [GtestImage.gmk already does](https://github.com/openjdk/jdk/blob/64bd8d2592d26e02a7f2f96caa47cba5e158aaa2/make/hotspot/test/GtestImage.gmk#L37).
> 
> I verified that with the proposed change, `make test TEST=gtest` works correctly both on WSL and on Cygwin. Other platforms are unaffected, because EXECUTABLE_SUFFIX is [empty on all non-Windows platforms](https://github.com/openjdk/jdk/blob/64bd8d2592d26e02a7f2f96caa47cba5e158aaa2/make/autoconf/toolchain.m4#L188).

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23555#pullrequestreview-2608790106