Meson

libnixf: use `std::strtof` for libc++ compatibility #1857

Job	Run time
nix-build-develop-clang (none, release, true)	2m 58s
nix-build-develop-gcc (none, release, true)	3m 20s
nix-build-develop-clang (none, release, false)	2m 55s
nix-build-develop-gcc (none, release, false)	3m 12s
nix-build-develop-clang (none, debug, true)	2m 41s
nix-build-develop-gcc (none, debug, true)	3m 1s
nix-build-develop-clang (none, debug, false)	2m 43s
nix-build-develop-gcc (none, debug, false)	3m 8s
nix-build-develop-gcc (undefined, release, true)	6m 43s
nix-build-develop-gcc (undefined, release, false)	6m 57s
nix-build-develop-gcc (undefined, debug, true)	3m 38s
nix-build-develop-gcc (undefined, debug, false)	3m 41s
	44m 57s

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