RFR: 7903156: remove jopt-simple dependency from jextract [v4]

[Athijegannathan Sundararajan]

> removed jopt-simple dependency as well as moditect grade plugin dependency. Piggybacking build.gradle change to enforce 'jtreg_home' check in jtreg task's doFirst block.

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:

  -C "-D FORCE_OPENBLAS_COMPLEX_STRUCT" does not work. For now changing it to -C-DFORCE_OPENBLAS_COMPLEX_STRUCT

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Changes:
  - all: https://git.openjdk.java.net/jextract/pull/19/files
  - new: https://git.openjdk.java.net/jextract/pull/19/files/b548a89d..d68a258c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jextract&pr=19&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jextract&pr=19&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jextract/pull/19.diff
  Fetch: git fetch https://git.openjdk.java.net/jextract pull/19/head:pull/19

PR: https://git.openjdk.java.net/jextract/pull/19