further cleanup to sysdep.h: avoid pulling in win and ia32; split header
up into stl, compiler, and the actual sys_* API. (all but the latter are
in PCH).
timer: also avoid dragging in ia32
win: move snprintf fix to posix.h
cpu: simplify reasoning about cores, now given as logicalPerCore (not
package)
vfs_optimizer: fix if archive building is partially disabled
This was SVN commit r5008.
