WSAA: make the WSAA macros contain their own buffer

WSAA: make the WSAA macros contain their own buffer

Make the WSAA macros contain their own buffer definitions.  This
eliminates the need to have a separate "workbuf" declared in the
outelf backends, which isn't even used for anything else, except for a
few completely redundant strcpys.

Note: these macros probably should be replaced with actual
functions.  The overhead of the function call is likely to be more
than offset by lower icache footprint.