Fix encode of binaries to terms inside struct series (#996) #445

Job	Run time
NIF 2.15 - aarch64-apple-darwin (macos-12 \| default)	53m 7s
NIF 2.15 - aarch64-unknown-linux-gnu (ubuntu-20.04 \| default)	23m 30s
NIF 2.15 - aarch64-unknown-linux-musl (ubuntu-20.04 \| default)	24m 31s
NIF 2.15 - x86_64-apple-darwin (macos-12 \| default)	45m 15s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2022 \| default)	37m 29s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2022 \| legacy_cpu)	35m 18s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019 \| default)	37m 50s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019 \| legacy_cpu)	36m 19s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| default)	22m 6s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| legacy_cpu)	23m 3s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04 \| default)	22m 1s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04 \| legacy_cpu)	20m 47s
NIF 2.15 - x86_64-unknown-linux-musl (ubuntu-20.04 \| default)	23m 4s
	6h 44m 20s

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