build: easy_build_x86.sh updated to support OpenBSD. Note that compiler building fails due to a sed incompatibility.
vfs: fixed a number of bugs in memory mapped files and anonymous mappings, and added support for removing mappings based on passed address.
posix: munmap is now implemented using MemoryMapManager::remove()
winman: free libpng structures (and associated memory) and close PNG file once loaded into memory.
vfs: copy (and return) less bytes than block size if EOF is hit in File::read
Merge branch 'develop' of ssh://pedigree-project.org:2200/git/pedigree into develop