[jdk17u-dev] RFR: 8314552: Fix javadoc tests to work with jtreg 7

[Dan Lutker]

Updating the tests to specify a UTF-8 encoding so that they work with jtreg-7 and the embedded testng jar.


bash ./configure --with-jtreg=jtreg-7.3+1
make images
make run-test TEST="jtreg:test/langtools/jdk/javadoc/doclet"

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

Commit messages:
 - 8314552: Fix javadoc tests to work with jtreg 7

Changes: https://git.openjdk.org/jdk17u-dev/pull/1672/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1672&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314552
  Stats: 18 lines in 6 files changed: 6 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1672.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1672/head:pull/1672

PR: https://git.openjdk.org/jdk17u-dev/pull/1672