MFC r284732:
MFC r284732:

Add __cxa_deleted_virtual to libcxxrt's version map.

This symbol can sometimes be emitted by clang++, and was not yet
exported from libcxxrt.  Attempt to be compatible with libsupc++ by
using the same CXXABI_1.3.6 symbol version.

Approved by:	re (kib)
Reported by:	yuri@rawbw.com
PR:		200863
Reviewed by:	emaste
Differential Revision: https://reviews.freebsd.org/D2850

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