The hpxcxx script was broken such that it could only compile for _release

[stevenrbrandt]

The hpxcxx script was broken such that it could only compile for _release. This modification makes it more robust in finding a compiled hpx installation and changes the 2 character flags to use -- instead of -.

Fixes #

Proposed Changes

• Changes 2 character flags so that they use -- instead of -
• Fixes bug which prevents non-release versions from working
• Makes specifying the release optional
• corrects relwithdebinfo to relwithdebuginfo

Any background context you want to provide?

Checklist

Not all points below apply to all pull requests.

• I have added a new feature and have added tests to go along with it.
• I have fixed a bug and have added a regression test.
• I have added a test using random numbers; I have made sure it uses a seed, and that random numbers generated are valid inputs for the tests.

[hkaiser]

LGTM, thanks!

[hkaiser]

bors merge

[bors]

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