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Remove old generated unwind.h when using LLVM libunwind

Description

Remove old generated unwind.h when using LLVM libunwind

When not using LLVM libunwind, unwind.h is a generated header and a stale
copy may remain in the OBJDIR after enabling LLVM libunwind. Explicitly
remove it.

Reported by: bz
Reviewed by: bdrewery
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D5019

Details