Meson

libnixf: parse ExprString #1877

Job	Run time
nix-build-develop-clang (none, release, true)	3m 1s
nix-build-develop-clang (none, release, false)	2m 57s
nix-build-develop-clang (none, debug, true)	2m 41s
nix-build-develop-clang (none, debug, false)	2m 41s
nix-build-develop-gcc (none, release, true)	3m 17s
nix-build-develop-gcc (none, release, false)	3m 12s
nix-build-develop-gcc (none, debug, true)	3m 6s
nix-build-develop-gcc (none, debug, false)	3m 2s
nix-build-develop-gcc (undefined, release, true)	6m 48s
nix-build-develop-gcc (undefined, release, false)	6m 39s
nix-build-develop-gcc (undefined, debug, true)	3m 39s
nix-build-develop-gcc (undefined, debug, false)	3m 45s
	44m 48s

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