Can't use install-path longer than 15 chars after 2.875 update

["Jacek Sowiński" <mruwek@gmail.com>]

After updating to setup-x86_64.exe version 2.875 I can't use install
paths longer than 15 chars and error is throwed:

> The install directory must be absolute, with both a drive letter and
> leading slash, like C:\Cygwin

Below are the contents of setup.log.full:

> 2016/08/31 19:09:26 Starting cygwin install, version 2.875
> 2016/08/31 19:09:26 User has NO backup/restore rights
> 2016/08/31 19:09:26 Current Directory: E:\PortableApps\CygwinPortable64\packages
> 2016/08/31 19:09:26 Could not open Service control manager
> 2016/08/31 19:09:29 source: network install
> 2016/08/31 19:09:30 mbox note: The install directory must be absolute, with both a drive letter and leading slash, like C:\Cygwin
> 2016/08/31 19:11:31 Ending cygwin install

I've double checked and this issue doesn't exist with 2.872. I don't
remember it also with 2.873 and 2.874 (I can't check those versions
right now, because after update I have only additional copy of 2.872).

I tried to attach cygcheck.out, but then my e-mails were rejected with
such message:

> 552 spam score exceeded threshold

-- 
Jacek Sowiński

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