Add MAME 0.78 to libretro-build.sh
Add rule so that Desmume is compiled with ARMv7 JIT if ARMv7 is
detected
libretro-build.sh builds Dosbox now as well
Add ScummVM to libretro-build.sh
Correctness fixes to PC scripts.
Fix some BSD incompatibilities.
Clean out dlls on win32 install.

Simplifies Win32 libretro building greatly.
Fix use of EXE variables.
Fix string quotes.
Add SceneWalker and ModelViewer to libretro-fetch.sh
Rename EXE variable to FORMAT_EXT so that it better fits in with
the other scripts
Use FORMAT_EXT in all scripts
Add ModelViewer and SceneWalker build targets for iOS, QNX and
PC
(Android) Add modelviewer and scenewalker
(Modelviewer/scenewalker build-common-console) Add extension to cp target name
(iOS) Uncomment FORMAT variable for iOS
Add NXEngine build to Xbox 1/360
libretro-build.sh now reuses libretro-build-common-consoles.h -
NOTE - all output filenames are now consistent with those of the
other platform ports - maister -you have to change the install scripts
now - naming convention now is ${name_of_core}_libretro.${extension}
Script fixes
Use libretro-build.sh now for Mingw - might be that we still need
to pass CC and CXX as params to the Makefile