Fixed issues with Win64 build failing to build ffmpeg

[nicklauslittle]

Description

buildmpeg.sh was changed to match the value assigned to ARCH in other scripts/batch files (x86_64). It looks like it was just typoed initially.

The ffmpeg patch fixes an issue where the zlib includes (zconf.h:477) were trying to #include <unistd.h> when compiled with Visual Studio. I tracked this down to the ffmpeg configure script creating #define HAVE_UNISTD_H 0 in config.h. This works fine for ffmpeg, since all its checks use #if HAVE_UNISTD_H, but does not work on zlib which uses #ifdef HAVE_UNISTD_H (zconf.h:436). The patch simply #undef HAVE_UNISTD_H if HAVE_UNISTD_H is set to 0. This will cause HAVE_UNISTD_H checks to work with both zlib and ffmpeg.

Motivation and Context

I wanted to check out the latest Kodi Alpha, and my build environment is Win64 using Visual Studio 2015. I followed the build instructions, but ended up running into errors. I tracked down the source of the different errors and came up with my best attempt at fixing them that worked with the existing build system.

How Has This Been Tested?

I ran the build from a clean state (git clean -xdf) with only my additional commit and was able to build, run tests, and use Kodi.

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the Code guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my change
• All new and existing tests passed

[Rechi]

jenkins build and merge