UWP: Require Windows 10 16299 or newer.

This is required to build with WGI support. Thanks for @FrozenChameleon for the fix!

Fixes #5504

VisualC-WinRT/SDL-UWP.vcxproj

@@ -416,10 +416,10 @@
     <AppContainerApplication>true</AppContainerApplication>
     <ApplicationType>Windows Store</ApplicationType>
     <ApplicationTypeRevision>8.2</ApplicationTypeRevision>
-    <TargetPlatformVersion>10.0.10069.0</TargetPlatformVersion>
-    <TargetPlatformMinVersion>10.0.10069.0</TargetPlatformMinVersion>
-    <WindowsTargetPlatformVersion>10.0.10240.0</WindowsTargetPlatformVersion>
-    <WindowsTargetPlatformMinVersion>10.0.10240.0</WindowsTargetPlatformMinVersion>
+    <TargetPlatformVersion>10.0.16299.0</TargetPlatformVersion>
+    <TargetPlatformMinVersion>10.0.16299.0</TargetPlatformMinVersion>
+    <WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformMinVersion>10.0.16299.0</WindowsTargetPlatformMinVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">