Julia 1.7.0beta4 atomics.h errors embedding Julia in C++ Windows 10 MSVC 2019 v142

[solaris783]

I get a host of compile errors (about 30) by trying to compile the simple "Embedding Julia in C++" https://docs.julialang.org/en/v1/manual/embedding/.

Here are the first 5:

1>C:\Users\VitalRoberto\AppData\Local\Programs\Julia-1.7.0-beta4\include\julia\julia_threads.h(321,5): error C2065: ‘__ATOMIC_SEQ_CST’: undeclared identifier
1>C:\Users\VitalRoberto\AppData\Local\Programs\Julia-1.7.0-beta4\include\julia\julia_threads.h(321,5): error C3861: ‘__atomic_signal_fence’: identifier not found
1>C:\Users\VitalRoberto\AppData\Local\Programs\Julia-1.7.0-beta4\include\julia\julia_threads.h(321,5): error C2065: ‘__ATOMIC_RELEASE’: undeclared identifier
1>C:\Users\VitalRoberto\AppData\Local\Programs\Julia-1.7.0-beta4\include\julia\julia_threads.h(321,5): error C3861: ‘__atomic_store_n’: identifier not found
1>C:\Users\VitalRoberto\AppData\Local\Programs\Julia-1.7.0-beta4\include\julia\julia_threads.h(325,9): error C2065: ‘__ATOMIC_SEQ_CST’: undeclared identifier

in 1.7, atomics.h doesn’t have good definitions for MSVC.
I copied the atomics.h from Julia 1.6.5 and got it to work (also had to define jl_atomic_cmpswap). Seems like someone overlooked this platform.