Get-EnvironmentInformation does not properly check for CoreCLR

The following code incorrectly reports that I am using CoreCLR on Windows PowerShell 5.1

https://github.com/PowerShell/PowerShell/blob/7dce4116c7182c99db33c5ad202743abe7cc2d88/build.psm1#L100-L117



Steps to reproduce
------------------

```powershell
Import-Module .\build.psm1
Get-EnvironmentInformation
```

Expected behavior
-----------------

```none
IsAdmin           : False
IsLinux           : False
IsCoreCLR         : False
IsWindows         : True
IsMacOS           : False
nugetPackagesRoot : C:\Users\MarkLocal\.nuget\packages
```

Actual behavior
---------------

```none
IsAdmin           : False
IsLinux           : False
IsCoreCLR         : True
IsWindows         : True
IsMacOS           : False
nugetPackagesRoot : C:\Users\MarkLocal\.nuget\packages
```

Environment data
----------------



```none
Name                           Value
----                           -----
PSVersion                      5.1.15063.726
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.15063.726
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
```

	# Use the .NET Core APIs to determine the current platform.
	# If a runtime exception is thrown, we are on Windows PowerShell, not PowerShell Core,
	# because System.Runtime.InteropServices.RuntimeInformation
	# and System.Runtime.InteropServices.OSPlatform do not exist in Windows PowerShell.
	try {
	$Runtime = [System.Runtime.InteropServices.RuntimeInformation]
	$OSPlatform = [System.Runtime.InteropServices.OSPlatform]

	$environment += @{'IsCoreCLR' = $true}
	$environment += @{'IsLinux' = $Runtime::IsOSPlatform($OSPlatform::Linux)}
	$environment += @{'IsMacOS' = $Runtime::IsOSPlatform($OSPlatform::OSX)}
	$environment += @{'IsWindows' = $Runtime::IsOSPlatform($OSPlatform::Windows)}
	} catch {
	$environment += @{'IsCoreCLR' = $false}
	$environment += @{'IsLinux' = $false}
	$environment += @{'IsMacOS' = $false}
	$environment += @{'IsWindows' = $true}
	}

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Get-EnvironmentInformation does not properly check for CoreCLR #5581

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Get-EnvironmentInformation does not properly check for CoreCLR #5581

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