RFR: 8323621: JDK build should exclude snippet class in java.lang.foreign [v2]

[Per Minborg]

> This PR proposes to remove the snippet files in `java/lang/foreign/snippet-files` from the build.

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Correct path to excluded directory

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17403/files
  - new: https://git.openjdk.org/jdk/pull/17403/files/de3b00a7..e00b123d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17403&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17403&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17403.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17403/head:pull/17403

PR: https://git.openjdk.org/jdk/pull/17403