RFR: 8264425: Update building.md on non-English locales on Windows

[Naoto Sato]

On Thu, 16 Nov 2023 16:41:05 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> Update the build documentation to reflect the fact that non-English locales are only supported on a "best effort" principle, and add instructions how to install the necessary language pack to Visual Studio.

doc/building.html line 404:

> 402: locale for a specific process like this in Windows. The only way is to
> 403: change the user locale setting to <strong>US English</strong>, which
> 404: will affect all applications run by the user.</p>

IIUC, it is not only the user locale, but also the system locale that derives the file path encoding should be set to US English (using the `UTF-8` beta option may help though)

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PR Review Comment: https://git.openjdk.org/jdk/pull/16694#discussion_r1396088768