RFR: 8328399: Add hs_err_pid* to .gitignore

[Andy Goryachev]

Add hs_err_pid* to .gitignore

Q: Any other files?

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

Commit messages:
 - 8328399: Add hs_err_pid* to .gitignore

Changes: https://git.openjdk.org/jfx/pull/1408/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1408&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328399
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1408.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1408/head:pull/1408

PR: https://git.openjdk.org/jfx/pull/1408