add initial source code from Gonetz's google code repo http://glidehqplusglitch64.googlecode.com/svn/trunk/ rev 281
ported over changes from mudlord's repository at https://github.com/mudlord/glide64
Update Glitch64 with code from previous efforts
Fix path to OSX SDK with XCode >=4.3
Fix path to OSX SDK with XCode >=4.3
Fix path to OSX SDK with XCode >=4.3
Fix path to OSX SDK with XCode >=4.3
Fix path to OSX SDK with XCode >=4.3
Include SDL header without SDL/ directory
Fix visual studio project xml file
Don't use long for pointers on 64-bit system

long may be 64 bit or 32 bit. On systems like Windows it is 32 bit and
therefore it cannot be used to store pointers.

The usage of intptr_t/uintptr_t should be evaluated to keep the code slightly
cleaner.
Disable PIC on MinGW to reduce warnings
Disable PIC on MinGW to reduce warnings
Disable PIC on MinGW to reduce warnings
Disable PIC on MinGW to reduce warnings
Link against pthreads on MinGW for localtime_r emulation
Fix long usage in rjump implementation of x86_64
Disable OSS under MinGW to prevent build failures during cross compiles
Use long long for pointers instead of long to avoid truncation on 64-bit Windows
Introduce WARNFLAGS for default (removable) compiler warning flags