The aomstats library is only used in the code examples, but we assume that all libraries should be linked into libxul, which leads to an unresolved external dependency on fatal at link time. This adds a guard to only build aomstats if we are building the examples.
This revision of libaom has some conflicts with our vendor script
and build system. A number of new .asm files have the same basename
as .c files, which our build system cannot handle.
To work around this, I manually renamed the conflicting
files in the filesystem and sources.mozbuild.
Also add av1_convolve_scale_sse4.c to sources.mozbuild manually.
This is needed by the build but for some reason isn't picked up
by generate_sources_mozbuild.sh.
Visual Studio 2015u3 fails to compile reconintra.c for win32
debug targets. It's confused by the #if conditional inside
the assert macro expansion.
The checks are obsolete upstream. Address the issue by
duplicating the assert calls for each branch of the
conditional.
