[jdk11u-dev] RFR: 8239708: Split basics.m4 into basic.m4 and util.m4 [v4]

[George Adams]

> The main conflict is the lack of the WSL backport ([8215445: Enable building for Windows in WSL](https://github.com/openjdk/jdk/commit/46eb26b692ac7f9431d5b479028ec87e56707557)) Something which doesn't apply particularly cleanly and isn't required to achieve the MSYS2 backport that I'm trying to reach.
> 
> This backport will also considerably help many build/toolchain backports going forwards as this one nearly always trips me up when I backport patches.
> 
> This backport will allow me to more easily backport [8257679: Improved unix compatibility layer in Windows build (winenv)](https://github.com/openjdk/jdk/commit/d29c78da).
> 
> @RealCLanger / @GoeLin I suggest that this is run through the full SAP nightlies before this is merged.

George Adams has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport 63f939636a5fe9871f5f9057c93ed5b1a9924265

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1277/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1277/files/3ed3057a..76209878

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1277&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1277&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1277.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1277/head:pull/1277

PR: https://git.openjdk.org/jdk11u-dev/pull/1277