Omit system/global config in fixture scripts even amidst strange filenames #4709

Job	Run time
pure-rust-build	1m 57s
test	12m 48s
cargo-deny (advisories)	30s
check-packetline (ubuntu-latest)	6s
lint	3m 36s
WebAssembly (wasm32-unknown-unknown)	1m 1s
cargo-deny (bans licenses sources)	37s
WebAssembly (wasm32-wasi)	35s
test-32bit (armv7-linux-androideabi)	59s
test-fast (windows-latest)	14m 53s
test-fast (macos-latest)	3m 7s
test-fast (ubuntu-latest)	3m 37s
Tests pass	1s
	43m 47s

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