if we include standard headers on glibc-based systems then
we can't use '__attribute__' (those are defined away for unknown
compilers) but must use '__attribute' (or #undef that token).
instead in vcheck_cmp(), pass the CODE_OFF_BIT to generators
unless other nocode purposes are set.
This reverts commit cad8739594.
Also in 128_run_atexit.c:
avoid line output disorder which may happen on windows when
tcc itself and runned code are using two different printf
implementations and tcc would print the "[Returns 1]" above
any output from the runned test.
