[foreign-jextract] RFR: 8249757: jextract should expose a way to load library from a given absolute path

[Athijegannathan Sundararajan]

-l option value is checked for path or simple name and handled accordingly

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Commit messages:
 - whitespace removed (jcheck)
 - 8249757: jextract should expose a way to load library from a given absolute path

Changes: https://git.openjdk.java.net/panama-foreign/pull/250/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/250/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8249757
  Stats: 141 lines in 7 files changed: 135 ins; 1 del; 5 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/250.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/250/head:pull/250

PR: https://git.openjdk.java.net/panama-foreign/pull/250