[Cin] on macos we have few undefined functions

[Andrew Randrianasulu]

You guess it - I tried to convince cingg to build on macos 10.12.6

bchash.C:184:13: error: use of undeclared identifier 'open_memstream'

seems to exist (reimplemented ) here


https://android.googlesource.com/platform/system/core/+/cf63d5d00f5a631a2905da7812b5c029b5211cf6%5E!/

fmemopen also used in bchash.C

https://github.com/mprzybylski/darwin-fmemopen


pthread_spinlock_t does not exist here ...

https://stackoverflow.com/questions/8177031/does-mac-os-x-have-pthread-spinlock-t-type

there is also bunch of  dirent64 vs dirent and this


ffmpeg.C:4499:26: error: no member named 'st_mtim' in 'stat'
                                       time_t t =
(time_t)tst.st_mtim.tv_sec;
                                ~~~ ^
                     ffmpeg.C:4502:20: error: no member named 'st_mtim' in
'stat'                                                       int64_t us =
tst.st_mtim.tv_nsec / 1000;
                        ~~~ ^
                   20 warnings and 19 errors generated.

====

I set build against wrong ffmpeg includes ....
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