Fixing support for disabled PER/OER in a couple of skeletons

[gareins]

trafficstars

Very self explenatory

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[eisaev]

@gareins, I've done a similar but more complex work here: https://github.com/mouse07410/asn1c/pull/67

JFYI: mouse07410's fork is currently the most developed, and the official repository, unfortunately, is almost frozen.