Workaround issue with jars (such as yoko.jar from issues.apache.org) being downloaded every time from servers that don't support If-Modified-Since HTTP headers.
Workaround issue with jars (such as yoko.jar from issues.apache.org)
being downloaded every time from servers that don't support
If-Modified-Since HTTP headers.

Since we are downloading to path/file names with versions in then
downloading more than once never makes sense.  This change means we
now only download if the file doesn't exist locally.

svn path=/incubator/harmony/enhanced/classlib/trunk/; revision=450435

freeVM/freeVM,freeVM/freeVM,freeVM/freeVM,freeVM/freeVM,freeVM/freeVM