build: disable compiler inlining on z/OS (#146)

In Node v14 on z/OS, test `test-exception.js` fails due to a
compiler issue with inlining.

This PR works around it by disabling compiler inlining.

I confirmed that, with this change, `npm test` continues to pass in
Node v8.17.0 (which uses D190508 compiler version), as well as in
Node v12.16.1 (which uses D191122 as in v14).

Once the new Wyvern on z compiler is available for use in Node v14,
we'll revisit and undo this change if Woz resolves the issue.

PR-URL: #146
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Co-authored-by: baghdadi <baghdadi@ca.ibm.com>

binding.gyp

@@ -14,8 +14,8 @@
  "dll_files": [ "dbghelp.dll", "Netapi32.dll", "PsApi.dll", "Ws2_32.dll" ],
  }],
  ["OS=='zos'", {
- "cflags!": [ "-O2", "-O3" ],
- "cflags": [ "-qascii" ],
+ "cflags!": [ "-O2", "-O3", "-qINLINE=::150:100000" ],
+ "cflags": [ "-qascii", "-qnoinline" ],
  }],
  ],
  "defines": [