fix struct flock
fix struct.stat
fix struct.dirent
fix struct.utimbuf
fix struct.statvfs
fix struct.pollfd
fix struct.utsname and allow simple bN syntax in struct definitions for fields of N bytes

Conflicts:
	src/library.js
fix struct.tm
fix struct.timespec
fix struct.tms
fix struct.rlimit
fix struct.rusage
test for issue #838