4.14 Launcher version ships with UE4-VulkanRHI*.a but requires Github source

Launcher build ships with VulkanRHI Android binaries but do not seem to support Vulkan on Android from the launcher build without source.

1. Install 4.14 preview 2 from the launcher, exclude source code.
2. Create a new project
3. Observe that Project Settings, Android, Support Vulkan is disabled and the tooltip says it requires Github source
4. Manually set bSupportsVulkan=True and bBuildForES2=False in the project's DefaultEngine.ini, restart editor
5. Launch on Nexus 6P

Crash "Assertion failed: bBuildForES2" indicating VulkanRHI was not linked.

Fix UE-51650

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