Segfault with lastest master

[Rick Walsh]

Hi,

I just built the latest master (d8ca04626589221c5f7c178e882cfaa4c095ce2a),
and it's segfaulting upon starting subsurface.  As I read there have been
significant changes to the subsurface marble branch, I tried removing all
the build dependency and install-root directories and  and re-ran
scripts/build.sh to download and build them all as intended.

Running within gdb:
 (gdb) run
Starting program: /home/rick/build/install-root/bin/subsurface
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fff82ffb700 (LWP 27541)]
[New Thread 0x7fff837fc700 (LWP 27540)]
[New Thread 0x7fffc3fff700 (LWP 27539)]
[New Thread 0x7fffca502700 (LWP 27538)]
[New Thread 0x7fffd812f700 (LWP 27537)]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff0519634 in qt_normalizePathSegments(QString const&, bool) ()
from /lib64/libQt5Core.so.5


I'm running Fedora 22:
 [rick at localhost bin]$ uname -a
Linux localhost.localdomain 4.0.6-300.fc22.x86_64 #1 SMP Tue Jun 23
13:58:53 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

 [rick at localhost bin]$ dnf list qt5-qtbase
Installed Packages
qt5-qtbase.x86_64   5.4.2-2.fc22  @System
Available Packages
qt5-qtbase.i686     5.4.2-2.fc22  updates
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