In #30882, we made Spack ignore `-Werror` calls so that it could more easily build
projects that inject `-Werror` into their builds. We did this by translating them to
`-Wno-error` in the compiler wrapper. However, some compilers (like `nvhpc`) do not
support `-Wno-error`. We need to exclude them from this feature until they do.
- [x] make a property on `PackageBase` for `keep_werror` that knows not to use it for
`nvhpc`.
- [x] update property so that it keeps only the specific `-Werror=...` args for newer nvhpc's,
which support `-Wno-error` but not `-Wno-error=...`
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Co-authored-by: William Mou <william.mou1024@gmail.com>
Co-authored-by: Tom Scogland <scogland1@llnl.gov>
Signed-off-by: Todd Gamblin <tgamblin@llnl.gov>
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