nix/glistix: move away from regex for src filter #18

Job	Run time
rustfmt	7s
lint-build	55s
test (stable, x86_64-unknown-linux-gnu)	1m 51s
test-flake (x86_64-unknown-linux-gnu)	1m 51s
test (stable, x86_64-unknown-linux-musl)	1m 40s
test-wasm	1m 8s
test-flake (x86_64-unknown-linux-musl)	1m 53s
test (stable, aarch64-unknown-linux-musl)	1m 41s
test-flake (aarch64-unknown-linux-musl)	1m 52s
test (stable, x86_64-apple-darwin)	1m 14s
test-flake (x86_64-apple-darwin)	1m 18s
test (stable, x86_64-pc-windows-msvc)	1m 39s
test-flake (aarch64-apple-darwin, macos-14)	1m 10s
test (stable, aarch64-apple-darwin, macos-14, false, true, true)	1m 39s
test-projects	50s
	20m 48s

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