Fix plisql tripword and wordtype package-datum handling

[Aias00]

Summary

Fixes #1648.

1. plisql_parse_tripword (src/pl/plisql/src/pl_comp.c): return true moved into the PKG_VAR case (matching plisql_parse_dblword); a a.b.c reference resolving to a non-variable package entry now falls through instead of returning true with wdatum->datum uninitialized.
2. plisql_parse_wordtype: PLISQL_DTYPE_PACKAGE_DATUM datums (standard-package variables) are now resolved through pkgvar before reading datatype/notnull, instead of mis-casting the package-datum struct (wrong on 32-bit, luck-dependent on 64-bit).

Test plan

• make -C src/pl/plisql/src pl_comp.o compiles cleanly.

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📥 Commits

Reviewing files that changed from the base of the PR and between c3529ba and e0d6e00.

📒 Files selected for processing (1)

• src/pl/plisql/src/pl_comp.c

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