Suppress yet more leaks reported by valgrind in orte/pmix

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Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +0.11% (target: -1.00%)	:white_check_mark: ∅ (target: 90.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (b5628dff094ba8d72c4b9ccf44ed6389a20e5935) | 18346 | 13762 | 75.01% | | | Head commit (6268f9d79718687b72323f0bf6a42663b3f1f793) | 18346 (+0) | 13783 (+21) | 75.13% (**+0.11%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#1253) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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