RFR: 8272352: Java launcher can not parse Chinese character when system locale is set to UTF-8

[Naoto Sato]

Java runtime has been detecting the Windows system locale encoding using `GetLocaleInfo(GetSystemDefaultLCID(), LOCALE_IDEFAULTANSICODEPAGE, ...)`, but it returns the *legacy* ANSI code page value, e.g, 1252 for US-English. In order to detect whether the user has selected `UTF-8` as the default, the code page has to be queried with `GetACP()`.
Also, the case if the call to `GetLocaleInfo` fails changed to fall back to `UTF-8` instead of `Cp1252`.

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Commit messages:
 - 8272352: Java launcher can not parse Chinese character when system locale is set to UTF-8

Changes: https://git.openjdk.java.net/jdk/pull/8434/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8434&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272352
  Stats: 13 lines in 1 file changed: 3 ins; 4 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8434.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8434/head:pull/8434

PR: https://git.openjdk.java.net/jdk/pull/8434