Import NetBSD dev_mkdb(8)

Adapt libc devname(3) to make use of it, so that such device name
queries are now several orders of magnitude faster. The database
is created and updated at system bootup

Import NetBSD dev_mkdb(8)

Adapt libc devname(3) to make use of it, so that such device name
queries are now several orders of magnitude faster. The database
is created and updated at system bootup time.

Change-Id: I0cbcb24c7d47577d4d6af9c8290c21ee4df9a0ff

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