BuildSystem: /bin/rm: Argument too big when calling jam clean

[X512]

This is hrev54881.

When running jam clean, following error appears:

> jam clean
Starting build of type regular ... 
...patience...
...found 1 target(s)...
...updating 1 target(s)...
[1/1] Clean clean 
/bin/sh: line 2: /bin/rm: Argument too big

[pulkomandy]

Note: "jam clean" takes a long time and does not work well anyway. It's recommended to simply remove the objects/, build_packages/ and maybe download/ directories from your generated directory instead.