This function is called to get the address of the C library errno variable
when the C library attempts to read or write errno.
The library provides a default implementation. It is unlikely that you
have to reimplement this function.
This function is not part of the C library standard, but is supported by the ARM C library as an extension.
Note
This function is associated with pre-ABI versions of the compilation
tools. However, it remains supported to ensure that object files
compiled with those tools link successfully. Unless you are working
with object files compiled with pre-ABI versions of the tools, use __aeabi_errno_addr() instead
of __rt_errno_addr().
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