closing parent process handle. Call fixup_mmaps_after_fork()
with parent process handle as parameter.
* mmap.cc (mmap_record::access): New method.
(fixup_mmaps_after_fork): Take process handle as parameter.
In case of FILE_MAP_COPY access, copy valid memory regions to child.
* pinfo.h (fixup_mmaps_after_fork): Change prototype accordingly.