but if the file in question is one that needs to be compiled (.c or .cc),
it still hands the bogus name to the compiler.
If Dir_MTime() cannot find such a file (gn->iParents is not empty),
see if the basename can be found via .PATH, and if so set gn->path to
the found file. This prevents the stale path being given to the
compiler.
In meta_oodate(), if a referenced file no longer exists, consider the
target out-of-date.
Also, if meta_oodate() decides a target is out-of-date, and it
it uses .OODATE in its commands, we need .OODATE recomputed.
Undo our call to Make_DoAllVar() so that the call from Make_OODate()
will do the right thing.
In this mode, a .meta file is created for each target, capturing
the expanded commands used, any command output, and if filemon(9)
is available, a record of system calls which are of interest.
Not enabled unless USE_META=yes is set when building make.
Also, if FILEMON_H exists, meta.c will be compiled to use filemon(9).
sjg