Missing RuntimePlatform enum value for Nintendo Switch

[evilwombat]

Hello. The RuntimePlatform enum needs to gain the following entry:
NintendoSwitch = 38
(and I need to be less sleepy and actually send a pull request, but I'll probably forget)

[nanoNago]

That's a build target enum -- build target and runtime platform are two different enum spaces. It's very likely that some existing usages of the RuntimePlatform actually want the BuildTarget instead.