Fix Compiler Warnings

User reported following compiler log when building project with Restyle
```
Warning Modules must specify an explicit precompiled header (
eg. PrivatePCHHeaderFile = "Public/Restyle.h") from UE 4.21

Warning Library Restyle/Binaries/ThirdParty/MinHook/Win64/minhook.x64.lib'
was not resolvable to a file when used in Module 'Restyle',
assuming it is a filename and will search library paths for it.
This is slow and dependency checking will not work for it.
Please update reference to be fully qualified alternatively use PublicSystemLibraryPaths
if you do intended to use this slow path to suppress this warning.

Warning Modules must specify an explicit precompiled header (
eg. PrivatePCHHeaderFile = "Public/RestyleShadersModule.h") from UE 4.21
```