DNG SDK new warnings with GCC 7.1+

[mattl...@live.com]

Just an FYI, there are new warnings when using the new GCC toolchains. Or at least when cross-compiling from x64 to armv7a:

[431/1112] compile ../../../third_party/externals/dng_sdk/source/dng_spline.cpp
In file included from /opt/arm-none-linux-gnueabihf/arm-none-linux-gnueabihf/include/c++/9.2.1/vector:72,
from ../../../third_party/externals/dng_sdk/source/dng_memory.h:30,
from ../../../third_party/externals/dng_sdk/source/dng_spline.h:22,
from ../../../third_party/externals/dng_sdk/source/dng_spline.cpp:16:
/opt/arm-none-linux-gnueabihf/arm-none-linux-gnueabihf/include/c++/9.2.1/bits/vector.tcc: In member function 'void std::vector<_Tp, _Alloc>::_M_realloc_insert(std::vector<_Tp, _Alloc>::iterator, _Ar
gs&& ...) [with _Args = {const double&}; _Tp = double; _Alloc = dng_std_allocator<double>]':
/opt/arm-none-linux-gnueabihf/arm-none-linux-gnueabihf/include/c++/9.2.1/bits/vector.tcc:426:7: note: parameter passing for argument of type 'std::vector<double, dng_std_allocator<double> >::iterato
r' {aka '__gnu_cxx::__normal_iterator<double*, std::vector<double, dng_std_allocator<double> > >'} changed in GCC 7.1
426 | vector<_Tp, _Alloc>::
| ^~~~~~~~~~~~~~~~~~~
I  

[mattl...@live.com]

Building the commit c8d0c9b1d16bfda56f15165d39e0ffa360a11123

[Mike Klein]

Thanks, this is not important.

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[mattl...@live.com]

Yeah. I added a "extra_cflags+=[ '-Wno-psabi' ]" to my build and everyone was happy :)

I also noticed a SkJSON in the list