Meson

libnixf: fix Lexer location indexes #1958

Job	Run time
nix-build-develop-clang (none, release, true)	2m 55s
nix-build-develop-gcc (none, release, true)	3m 29s
nix-build-develop-clang (none, release, false)	3m 5s
nix-build-develop-gcc (none, release, false)	3m 13s
nix-build-develop-clang (none, debug, true)	2m 41s
nix-build-develop-gcc (none, debug, true)	3m 6s
nix-build-develop-clang (none, debug, false)	2m 43s
nix-build-develop-gcc (none, debug, false)	3m 7s
nix-build-develop-gcc (undefined, release, true)	7m 0s
nix-build-develop-gcc (undefined, release, false)	6m 48s
nix-build-develop-gcc (undefined, debug, true)	3m 43s
nix-build-develop-gcc (undefined, debug, false)	3m 39s
	45m 29s

Provide feedback