#i125121# speed up the "make writeable" step when building external libraries

avoiding the many individual invocations of chmod for each directory strips makes
this step about ten times faster on Windows without SSD (460sec -> 41sec for boost).
With SSD the speedup should be even higher.


git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1603756 13f79535-47bb-0310-9956-ffa450edef68