pyo3-macros-backend: Replace pyo3-build-config
with abi3
feature
#2243
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Python 3.6 and older are not supported by the current PyO3 version,
so the removed interpreter version check was a no-op.
pyo3_build_config::get()
attempts to read a config file from diskwhen PyO3 is cross-compiling, which is probably bad for rust-analyzer
and other IDEs that attempt to sandbox the proc macro code.