Allow missing options in open() calls #12402

Job	Run time
Build Erlang/OTP (64-bit)	25m 31s
Event File	5s
Build Erlang/OTP (iOS)	8m 59s
Build Erlang/OTP (macOS)	11m 38s
Build Erlang/OTP (32-bit)	16m 23s
Build Erlang/OTP (cross-compile)	28m 12s
Build Erlang/OTP (clang)	10m 23s
Build Erlang/OTP (Types and Flavors)	0s
Build Erlang/OTP (Windows)	19m 26s
Build and check documentation	10m 32s
Run static analysis	10m 4s
Test Erlang/OTP (kernel)	1h 1m 52s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	11m 57s
	3h 35m 2s

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