Remove even more unnecessary `needs-flag' attributes from config machinery,
as well as useless include of the generated flag files.

Factorize akbd and ams drivers between mac68k and macppc; while there, start
moving out common adb code as well, and merge adb_direct.c into adb.c to
simplify external header files.

No functional ch

Factorize akbd and ams drivers between mac68k and macppc; while there, start
moving out common adb code as well, and merge adb_direct.c into adb.c to
simplify external header files.

No functional change; more cleanups to come.

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