factor out MANIFEST, SRCS, DOCS, IMPORTS and COPY

- mak/posix.mak for simple GNU make include
add missing windows rules

- linux/epoll.d, linux/sys/signalfd.d, posix/sys/ioctl.d, posix/sys/statvfs.d
Merge pull request #404 from dawgfoto/redundantMakefiles

redundant makefiles