preproc: handle %+ even during early token replacement
Preexisting code seems to rely on %+ being processed even during early
token replacement, e.g. Syslinux contains the following code:
%macro superb 1
bx %+ %1 equ SuperInfo+($-superblock)*8+4
bs %+ %1 equ $
zb 1
%endmacro
... which is expected to work when invoked as:
superb Media
As a result, set handle_paste_tokens to true at all times; assuming
this turns out to be the way things are we can really just remove it
as an option.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>