libnatspec: unmark broken on darwin

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-1
pkgs/development/libraries/libnatspec/default.nix
··· 16 propagatedBuildInputs = [ libiconv ]; 17 18 meta = with lib; { 19 - broken = stdenv.isDarwin; 20 homepage = "http://natspec.sourceforge.net/"; 21 description = "A library intended to smooth national specificities in using of programs"; 22 platforms = platforms.unix;
··· 16 propagatedBuildInputs = [ libiconv ]; 17 18 meta = with lib; { 19 homepage = "http://natspec.sourceforge.net/"; 20 description = "A library intended to smooth national specificities in using of programs"; 21 platforms = platforms.unix;