Wrap all android code in an `#ifdef UNITY_ANDROID` #378

Job	Run time
Configure Build Parameters	35s
Windows OpenXR	4m 15s
Windows Pimax	4m 14s
Windows Rift	4m 14s
Windows Monoscopic	4m 1s
Linux Monoscopic	2m 21s
MacOS Monoscopic	2m 1s
Android OpenXR	5m 2s
Oculus Quest	4m 38s
Android Pico	5m 22s
Android Pico (CN)	4m 56s
Create Github Release	0s
Publish Pimax Release	0s
Publish changelog from last major build to open-brush-docs	0s
Publish Itch.io Release	0s
Publish Oculus Quest Release	0s
Publish Oculus Rift Release	0s
Publish Steam Release	0s
Publish Viveport Release	0s
	41m 39s

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