This avoids the need to separately execute `mt.exe` to perform the
embedding of manifests into the output for non-incremental links. The
primary motivation for this change is that this separate execution of
`mt.exe` to embed manifests is known to cause intermittent failures due
to AV/security scanning.
The only change in behavior is that any linker generated manifest will
no longer be output as a separate manifest file alongside the output
file.
Fixes: #24531
Previously we merged user-provided manifests only into the manifest file
given to the linker. Merge them into the manifest file that is compiled
as a resource too.
Andrew Ng