DOSBox 0.74-2

What's new in this version:

- Rewrite auto/max cycles algorithm to work better with windows 7, other OSes might benefit as well
- Update 64bit recompiler to work on OSX and Linux
- Several improvements to make the recompilers work with newer compilers and add some workarounds about clang confusing itself
- Fix several variables being the wrong size in the recompiler
- Support absolute 64 bit addressing (DRC:64 bit error messages)
- Zero extend data in dynrec core for LLVM compilation
- Reduce overhead of the Mac version with a lot. Results in a speed increase
- Replace NV_PixelDataRange with the more common ARB_PixelBufferObject extension. Should help with output=opengl
- Reuse graphics window if possible instead of always creating a new one

Add patches to work better when called by WINE:
- support WINE style namemangling
- allow Z: to be moved to a different drive
- Try to fix stuttering audio with opengl output on Linux (or at least improve it. Linux users might need to increase the prebuffer option a bit)
- Fix automake and autoconf problems
- Fix problems related to packed struct layouts
- Fix compilation on gcc 4.4 and gcc 4.6.1
- Fix compilation with -DPIC
- Hopefully fix crash on shutdown, when unknown condition is encountered
- Fix -lto with gcc
- Fix clang compliation with asm fpu core
- Fix mapper crash on startup and when changing the mapper key
- Fix compilation in VS2015
- Fix compilation on mingw64
- Fix compilation on Frisbee and newer clang
- Fix compilation machines that have X11 libraries installed, but use a SDL without X11

Fix a few problems relating to video capturing:
- Writing out the index too often (slowdown with longer captures)
- Not being aware of when only the refresh rate changed
- Fix call order when bitshifting the return order (VS C /O2 builds)
- Fix sign-extension error in S3 draw funcion, i.e. win3.1 analog clock
- Fix expanddot not caring about the size of the inputbuffer
- Some fixes for the debugger related to starting a program through debug.com
- Bring OS/2 port code up to date
- Reduce the amount of warning when compiling with quite a bit
- Allow 15/26/32 bits input to the opengl output
- Add cmd-q as exit key for macs
- Fix icon and titlebar on very old setups
- Fix off by one display size calculation errors with very large displays
- Fix out of bounds access the unused byte in the 32 bit colour value of the hardware mouse cursor pixel was affected
- Fix depreciated warnings on Mac, allow soundfont loading for coreaudio
- Keep repeating a pressed key if another key was unpressed
- Fix crash on OS X related to putting junk in the titlebar
- Extend fullresolution=0x0 to work on Linux and Mac
- Change gameblaster and tandy sound core to latest mame version
- Improve numlock and capslock support on Linux and Macs. Still not perfect on Windows
- Added even more code to workaround Windows behaving weirdly with alt-tab