[foreign-jextract] RFR: 8241650: jextract module should be mapped to application class loader

[Athijegannathan Sundararajan]

fixed makefile to map jextract module to application class loader

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Commit messages:
 - 8241650: jextract module should be mapped to application class loader

Changes: https://git.openjdk.java.net/panama-foreign/pull/66/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/66/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8241650
  Stats: 42 lines in 2 files changed: 41 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/66.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/66/head:pull/66

PR: https://git.openjdk.java.net/panama-foreign/pull/66