Add QNX support.

[camachat]

Fix compiling by QNX 7 SDK.

[mrdeep1]

Thanks for adding in QNX platform support. However the way that you have raised this PR is likely to cause some downstream issues.

The 2 additional merges 'Merge branch ...' need to be removed as as they will add in unnecessary log entries into the obgm/develop branch. Whenever a third-party PR is merged into the obgm/develop branch, github automatically does a rebase of PR with the the obgm/develop branch, and assuming the rebase has no issues the PR merge goes to completion. However, as can be seen in #329, github will not allow a PR to get merged if there are any rebase issues with obgm/develop.

The branch of your PR should not be develop, but have some other relevant descriptive name (such as qnx_support).

I suggest that you follow the guidelines as per https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/configuring-a-remote-repository-for-a-fork , and https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork for managing your fork of obgm/develop. It is always best to leave the develop branch as an identical copy of the develop branch of obgm/develop )even if it is a commits behind). Then if your develop branch gets rebased against obgm/develop, it will still be identical.

I would prefer the commit title to be "QNX: Add platform support" to help future users work out what has been done here.

[mrdeep1]

Changes cleaned up and PR created as #1339 for merging.