Cog VM binaries as per VMMaker.oscog-eem.154/r2540.

Fix bad conceptual bug with become on methods. �Unlike full and incremental GC,

the reference from a Cog method to its method object must not be remapped since

they're two halves of the same object.

Fix FileStreamTest>testPositionPastEndIsAtEnd on unix & Mac OS.

Merge Merge VMConstruction-Plugins-OSProcessPlugin-dtl.33's changes.

Regenerate the apparently truncated nscogsrc ZipPlugin.c.

Handle more libc variations for LD_LIBRARY_PATH in the unix launch scripts.

Eliot