[Modules/Windows] Crashing on start scapy modules

[gpotter2]

Following roadmap #399

While testing stuff on every scapy file, i've noticed out that some modules were not working at all (crashing) when importing.
Here's my list:

Windows only:

• modules.VoIP:

>>> from scapy.modules.voip import *
Traceback (most recent call last):
  File "Z:\github\scapy\scapy\modules\voip.py", line 15, in <module>
    from fcntl import fcntl
ImportError: No module named fcntl

• contrib.ppi_geotag.py

>>> from scapy.contrib.ppi_geotag import *
Traceback (most recent call last):
  File "Z:\github\scapy\scapy\contrib\ppi_geotag.py", line 338, in <module>
    Fixed6_4Field("Altitude_g", None),   GPSTime_Field("GPSTime", None),
  File "Z:\github\scapy\scapy\contrib\ppi_geotag.py", line 193, in __init__
    return LETimeField.__init__(self, name, default, strf="%a, %d %b %Y %H:%M:%S UTC")
  File "Z:\github\scapy\scapy\contrib\ppi_geotag.py", line 174, in __init__
    self.delta = time.mktime(epoch) - time.mktime(time.gmtime(0))
OverflowError: mktime argument out of range

[gpotter2]

Both fixed