Fixes builds where environment variable has backslashes

[seecrypt]

If an environment variable such as PATH contains a backslash Visual Studio interprets the next line as part of the comment. When a user attempts to build the .sln he or she will see errors relating to a missing brace "}".

Before fix, the following code is generated in winrtcomponent.cpp and Visual Studio does not recognize the brace in the line }//end:ms\test.bat

...
    end_0:
    echo("end_0:");
    //PATH=C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\CommonExtensions\Microsoft\TestWindow;C:\Program Files (x86)\Microsoft SDKs\F#\3.1\Framework\v4.0\;C:\Program Files (x86)\MSBuild\12.0\bin;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\;C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\BIN;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\Tools;C:\Windows\Microsoft.NET\Framework\v4.0.30319;C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\VCPackages;C:\Program Files (x86)\HTML Help Workshop;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Team Tools\Performance Tools;C:\Program Files (x86)\Windows Kits\8.1\bin\x86;C:\Program Files (x86)\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\;C:\Perl64\site\bin;C:\Perl64\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\;C:\Program Files\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files\Perforce;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\
}//end:ms\test.bat
...

The user will see error messages of this type:

...
Error   75  error C1075: end of file found before the left brace '{' at 'C:\Users\Seecrypt\git\openssl\vsout\\winrtcomponent.cpp(105)' was matched  C:\Users\Seecrypt\git\openssl\vsout\\winrtcomponent.cpp 1412    1   NT-Phone-8.1-Dll-Unicode-winrtcomponent
...

By encapsulating the environment variable contents in quotation marks we can prevent Visual Studio from marking the brace in "}//end:ms\test.bat" as being a comment. Generated code with fix:

...
    end_0:
        echo("end_0:");
        //PATH="C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\CommonExtensions\Microsoft\TestWindow;C:\Program Files (x86)\Microsoft SDKs\F#\3.1\Framework\v4.0\;C:\Program Files (x86)\MSBuild\12.0\bin;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\;C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\BIN;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\Tools;C:\Windows\Microsoft.NET\Framework\v4.0.30319;C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\VCPackages;C:\Program Files (x86)\HTML Help Workshop;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Team Tools\Performance Tools;C:\Program Files (x86)\Windows Kits\8.1\bin\x86;C:\Program Files (x86)\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\;C:\Users\Dino\ConEmuPack.141206;C:\Users\Dino\ConEmuPack.141206\ConEmu;C:\Perl64\site\bin;C:\Perl64\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\;C:\Program Files\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files\Perforce;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\"
    }//end:ms\test.bat
...