- disables --bootstrap-mode where it was enabled, except for test1000
which needs to build in bootstrap-mode to check that M2-Planet can be
compiled by cc_*
- the only hold-out is test0021 which needs getcwd which is missing in
M2libc
- note that test0106 needs a fix to fgetc or it will never notice it has
reached the end of stdin
- // and # lines always appear in the result of read_all_tokens
- in bootstrap mode, // tokens (but not the subsequent lines) and #
lines are stripped. no preprocessing happens.
- in non-bootstrap mode, // lines are stripped and # lines stay for the
preprocessing phase
- updates tests to pass --bootstrap-mode when necessary