src: make root_cert_vector function scoped
root_cert_vector currently has file scope and external linkage, but is only used in the NewRootCertsStore function. If this is not required to be externally linked perhaps it can be changed to be static and function scoped instead.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
src