update libcxx, libcxxabi and libunwind to 16.0.6;tested by and input from tb@; ok kettenis@
Update build infrastructure for LLVM 13.0.0.
remove netbsd specific LIBRARY section; ok jca
Minor mandoc -Tlint fixesok mortimer@
Indentationok mortimer@
No RCS IDs in shlib_version filesok mortimer@
Add libexecinfo.Based on NetBSD implementation, without the libelf dependency. Architectureswhich have libunwind use libunwind, and others use a stub implementationthat does nothing since __built
Add libexecinfo.Based on NetBSD implementation, without the libelf dependency. Architectureswhich have libunwind use libunwind, and others use a stub implementationthat does nothing since __builtin methods are unreliable.Much feedback and help from jca@.ok kettenis@ sthen@
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