Add Exhaustive DejaGnu directives lookup table & update `rustc-1.49.0` paths #38

Job	Run time
Cargo Build, Test, Clippy, Fmt (nightly)	20s
Cargo Build, Test, Clippy, Fmt (stable)	23s
Cargo Build, Test, Clippy, Fmt (beta)	19s
	1m 2s

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