building "distribution sets" fails due to missing kernel "*.debug" files

["John D. Baker" <jdbaker%consolidated.net@localhost>]

I routinely build "distribution sets" for "playstation2" since the
kernel doesn't build.

Since the addition of the "netbsd-${CONF}.debug" files, building the
debug set fails if the expected kernels were not built.

In the case of "playstation2", it also wants the "*.debug" files for
32-bit "evbmips-mipsel" kernels:

======  8 missing files in DESTDIR  ========
Files in flist but missing from DESTDIR.
File wasn't installed ?
------------------------------------------
./usr/libdata/debug/netbsd-aumac0-ALCHEMY.debug
./usr/libdata/debug/netbsd-aumac0-DBAU1500.debug
./usr/libdata/debug/netbsd-aumac0-DBAU1550.debug
./usr/libdata/debug/netbsd-aumac0-INSTALL_OMSAL400.debug
./usr/libdata/debug/netbsd-aumac0-MTX-1.debug
./usr/libdata/debug/netbsd-aumac0-OMSAL400.debug
./usr/libdata/debug/netbsd-reth0-CPMBR1400.debug
./usr/libdata/debug/netbsd-sd0a-CPMBR1400.debug
========  end of 8 missing files  ==========

Can things be conditioned so that if the kernel wasn't built, it is not
an error to not have the ".debug" file for it--particularly if you're
building a platform related to another as "playstation2" is related to
"evbmips", but has it's own kernel config (which isn't built either)?

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