nixd/Controller: Conditionally include devenv option support by default #3172

Job	Run time
nix-build-develop-clang (none, release, true)	3m 0s
nix-build-develop-clang (none, release, false)	2m 59s
nix-build-develop-gcc (none, release, true)	3m 10s
nix-build-develop-clang (none, debug, true)	2m 46s
nix-build-develop-clang (none, debug, false)	2m 52s
nix-build-develop-gcc (none, release, false)	3m 5s
nix-build-develop-gcc (none, debug, true)	3m 0s
nix-build-develop-gcc (none, debug, false)	3m 2s
nix-build-develop-gcc (address, release, true)	4m 47s
nix-build-develop-gcc (address, release, false)	4m 39s
nix-build-develop-gcc (address, debug, true)	3m 58s
nix-build-develop-gcc (address, debug, false)	3m 52s
nix-build-develop-gcc (undefined, release, true)	4m 6s
nix-build-develop-gcc (undefined, release, false)	4m 13s
nix-build-develop-gcc (undefined, debug, true)	3m 21s
nix-build-develop-gcc (undefined, debug, false)	3m 20s
	56m 10s

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