Provide static initializers for PMIx structs

[rhc54]

Programs that utilize PMIx structures benefit from
being provided with static initializers by which global
variables can be safely declared.

Signed-off-by: Ralph Castain rhc@pmix.org

[rhc54]

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[jjhursey]

What arguments do these macros take?
Should we make them functions per PR #383?

[jjhursey]

PMIx ASC 1Q 2022

• Passed the first vote: 11 yes / 0 no / 0 abstain
• This is can be merged into main/v5 and v4 branches (I'll work on that)