COMP: Fix pcre package Linux download error relocating file on midas.

This commit is an attempt to fix the following download error
happening on linux:

// -----------------
CMake Error at PCRE-stamp/download-PCRE.cmake:27 (message):
error: downloading
'http://downloads.sourceforge.net/project/pcre/pcre/8.12/pcre-8.12.tar.gz'
failed

status_code: 7
status_string: "couldn't connect to server"
log: About to connect() to downloads.sourceforge.net port 80 (#0)
Trying 216.34.181.59... connected

Connected to downloads.sourceforge.net (216.34.181.59) port 80 (#0)

GET /project/pcre/pcre/8.12/pcre-8.12.tar.gz HTTP/1.1

User-Agent: curl/7.16.1

Host: downloads.sourceforge.net

Accept: /

HTTP/1.1 302 Found

Server: nginx

Date: Sat, 27 Jun 2015 03:14:40 GMT

Content-Type: text/html; charset=UTF-8

Connection: close

content-disposition: attachment; filename="pcre-8.12.tar.gz"

Set-Cookie:
sf_mirror_attempt="pcre:superb-dca2:pcre/8.12/pcre-8.12.tar.gz";
expires=120; Path=/

Location:
http://superb-dca2.dl.sourceforge.net/project/pcre/pcre/8.12/pcre-8.12.tar.gz

Content-Length: 337

Closing connection #0

Issue another request to this URL:
'http://superb-dca2.dl.sourceforge.net/project/pcre/pcre/8.12/pcre-8.12.tar.gz'

About to connect() to superb-dca2.dl.sourceforge.net port 80 (#0)

Trying 209.61.193.20... Connection timed out

couldn't connect to host

Closing connection #0

couldn't connect to server
// -----------------

git-svn-id: http://svn.slicer.org/Slicer4/trunk@24365 3bd1e089-480b-0410-8dfb-8563597acbee