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This reverts commit e0571f28.

The proper fix is on the libunwind-devel side of things.

For i686-musl linking against libunwind is still necessary, even if
the build of libunwind itself does not need it.

This is merely a workaround. Probably libunwind could include
the dependency on libucontext in its pkgconfig file.

The License essentially forbids, or at least makes it questionable to
vendor patches. Drop it since upstream is slow to fix compilation
problems and it doesn't compile with qt5.15 with quite some time.

Closes: #24092
Closes: #24143 [via git-merge-pr]

Closes: #20402
Closes: #24145 [via git-merge-pr]

Closes: #24133 [via git-merge-pr]