test: set type=none on IBM i for empty source

[abmusse]

addon targets.

openssl-binding, openssl-get-ssl-ctx,
openssl-providers, and zlib-binding all exclude
their sources on IBM i because the platform ships
OpenSSL and zlib as system libraries.
The binding.gyp condition leaves the target with
no sources but still of type 'loadable_module',
which causes gyp to generate a full solink_module
COPY rule in the generated Makefile.

With gcc-12, the compiler exits 1 on empty input
so gmake stops at the link step and
build_addons.py skips the addon non fatally. With
clang-21, the compiler exits 0 on empty input and
writes no output file. The linker driver then
runs llvm-nm internally as a post-link step to
generate the .exp symbol export file, finds no
output and aborts with:

llvm-nm: error: a.out: No such file or directory

See: https://ci.nodejs.org/job/node-test-commit-ibmi/nodes=ibmi74-ppc64/2438/console

The fix is to declare the target as type
'none' when on IBM i. The gyp make generator
produces only a touch-stamp rule for 'none'
targets no solink_module, no COPY, no .node
output is ever expected. build_addons.py sees
exit 0 and run-ci continues.

Test build with this fix:

https://ci.nodejs.org/job/node-test-commit-ibmi/nodes=ibmi74-ppc64/2437/console

Signed-off-by: Abdirahim Musse 33973272+abmusse@users.noreply.github.com

[nodejs-github-bot]

Review requested:

• @nodejs/gyp

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.14%. Comparing base (d996610) to head (9b112f3).
⚠️ Report is 223 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65545      +/-   ##
==========================================
- Coverage   90.30%   90.14%   -0.17%     
==========================================
  Files         751      751              
  Lines      249116   253635    +4519     
  Branches    47043    47787     +744     
==========================================
+ Hits       224974   228636    +3662     
- Misses      15509    16263     +754     
- Partials     8633     8736     +103     

see 182 files with indirect coverage changes

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