kicad.exe/pcbnew.exe has stopped working when loading a *.kicad_pcb file (lp:#1800339)

[Original report](https://bugs.launchpad.net/bugs/1800339) created by **Benjamin (bvernoux)**
```
I'm testing nightly build kicad-r11660.4b44cbe69-x86_64.exe &
kicad-r11660.4b44cbe69-i686.exe on my computer Windows 7 ASUS PC
Now when I open a kicad_pcb board I obtain "kicad.exe has stopped working"
See picture
KiCad_pcb_new_kicad-r11660.4b44cbe69-x86_64_Stopped_Responding.png
For information all was working fine with kicad-r11192.e0316af69-x86_64.exe
If I click on debug (with Visual Studio 2013)I cannot see anything
interesting ... as it returns me Unhandled exception at 0x0000000000000000
in kicad.exe: 0xC0000005: Access violation executing location
0x0000000000000000.

I have exported my simple project which reproduce this issue all the time
when we open the HydraBus_1_0_Rev1_3.kicad_pcb
You can find the full project here:
https://hydrabus.com/HydraBus_1_0_Rev1_3_KiCad.zip

For information I can also reproduce this issue when I try to open any
*.kicak_pcb on other projects and examples like:
kicad-20181028-r11660\share\kicad\demos\ecc83 when
kicad-20181028-r11660\share\kicad\demos\flat_hierarchy
...
I can also reproduce this issue by launching
kicad-20181028-r11660\bin\pcbnew.exe
Then I choose in pcbnew menu File->Open (on any .kicak_pcb) I obtain
pcbnew.exe has stopped working

It is a real blocker as it seems pcbnew cannot open any kicad_pcb board
without freezing

Just for information my nightly builds are downloaded on
http://downloads.kicad-pcb.org/windows/nightly/
My PC configuration is:
Laptop Asus N56VZ + Windows 7 64-bit SP1 + Intel Core i7-3630QM CPU 2.40GHz
+ Intel(R) HD Graphics 4000/NVIDIA GeForce GT 650M + 16GB DDR3 + SSD 500GB

Update with this issue with more tests:
I do not reproduce this issue on XUbuntu 16.04.5 LTS (with VirtualBox
5.2.20):
https://code.launchpad.net/~js-reynaud/+archive/ubuntu/ppa-kicad/+packages
build
Tested with:
* Version: 6.0.0-rc1-unknown-3dddca7~66~ubuntu16.04.1, release build
* Version: 6.0.0-rc1-unknown-4b44cbe~66~ubuntu16.04.1, release build

I do not reproduce this issue on Windows 7 with:
* http://downloads.kicad-
pcb.org/windows/nightly/kicad-r11642.90233e5ec-x86_64.exe

I can reproduce this issue on Windows 7 with:
* http://downloads.kicad-
pcb.org/windows/nightly/kicad-r11652.d95372436-x86_64.exe
* http://downloads.kicad-
pcb.org/windows/nightly/kicad-r11656.59fb6d885-x86_64.exe
* http://downloads.kicad-
pcb.org/windows/nightly/kicad-r11660.4b44cbe69-i686.exe
* http://downloads.kicad-
pcb.org/windows/nightly/kicad-r11660.4b44cbe69-x86_64.exe

Conclusion the issue is after kicad-r11642 (26 Oct 2018)
* I suspect it is related to commit
2d8f1df293df22483a9aa51b99eca16dc4c0c3fe Branch RevNo: 11647 as It is the
only things I see related directly to pcbnew (between r11642 & r11652)

This issue seems clearly to be related to
https://lists.launchpad.net/kicad-developers/msg38196.html
Especially point https://stackoverflow.com/questions/10209871/c11-stdasync-
doesnt-work-in-mingw
As some version of mingw does not support correctly c++11 std::async which
is used in the code in commit 2d8f1df293df22483a9aa51b99eca16dc4c0c3fe

This issue is fixed when using latest nickoe toolchain with new version:
http://downloads.kicad-
pcb.org/windows/testing/new_toolchain/kicad-r11660.4b44cbe69-x86_64.exe
```
Original tags: packaging windows

Story points: 30.0