[vcpkg] Build failure when the path contains multiple spaces

[JackBoosY]

Describe the bug
Build fails when vcpkg is built in a path with multiple spaces.

Environment

• OS: Windows 10
• Compiler: Visual Studio 2017

To Reproduce
Steps to reproduce the behavior:

1. create folder named Ne w folder(double spaces after w) in the root folder
2. clone vcpkg
3. .\bootstrap-vcpkg.bat

Expected behavior
Build vcpkg successful.

Failure logs

PS G:\Ne w   folder\vcpkg> .\bootstrap-vcpkg.bat

Building vcpkg.exe ...

. : The term 'G:\Ne w folder\vcpkg\scripts\cleanEnvironmentHelper.ps1' is not recognized as the name of a cmdlet,
function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the
path is correct and try again.
At line:1 char:3
+ . "G:\Ne w folder\vcpkg\scripts\cleanEnvironmentHelper.ps1"; & "C:\Pr ...
+   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (G:\Ne w folder\...nmentHelper.ps1:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

MSBUILD : error MSB1009: Project file does not exist.
Switch: G:\Ne w folder\vcpkg\toolsrc\windows-bootstrap\vcpkg.vcxproj
G:\Ne w   folder\vcpkg\scripts\bootstrap.ps1 : Building vcpkg.exe failed. Please ensure you have installed Visual
Studio with the Desktop C++ workload and the Windows SDK for Desktop C++.
At line:1 char:4
+ & {& 'G:\Ne w   folder\vcpkg\scripts\bootstrap.ps1' }
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,bootstrap.ps1

ScriptHalted
At G:\Ne w   folder\vcpkg\scripts\bootstrap.ps1:411 char:5
+     throw
+     ~~~~~
    + CategoryInfo          : OperationStopped: (:) [], RuntimeException
    + FullyQualifiedErrorId : ScriptHalted

Additional context
Add any other context about the problem here.
N/A

[BillyONeal]

Will be fixed by #15474