changes needed to compile in windows 64 on visual studio 2012

Google logging needs two changes:

1)
update logging.cc:1457: _asm int 3 --> __debugbreak()

https://code.google.com/p/google-glog/issues/detail?id=34#c1

  1. update port.h:

replace

#define hash  hash_compare

with

#if defined(_MSC_VER) && (_MSC_VER < 1700)
#define hash  hash_compare
#endif

https://code.google.com/p/google-glog/issues/detail?id=117

Thanks! I have added a pointer to this conversation in the FAQ:
https://code.google.com/p/orthanc/wiki/FAQ?ts=1398244254&updated=FAQ#Troubleshooting