Upgrade SwiftShader solution and projects to Visual Studio 2017.

Chrome now uses Visual Studio 2017 as the default compiler on Windows.
To ensure we maintain compatibility during standalone development, we
should use VS2017 for SwiftShader as well. The 'Community' edition of
Visual Studio 2017 is freely available.

Bug chromium:683729

Change-Id: I3ed1edaeb9fa786b575202ba5b9c86faf1daa3c0
Reviewed-on: https://swiftshader-review.googlesource.com/13048
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/SwiftShader.sln b/SwiftShader.sln
index d0501a3..c216b78 100644
--- a/SwiftShader.sln
+++ b/SwiftShader.sln
@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00

-# Visual Studio 14

-VisualStudioVersion = 14.0.25420.1

+# Visual Studio 15

+VisualStudioVersion = 15.0.26730.16

 MinimumVisualStudioVersion = 10.0.40219.1

 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "LLVM", "LLVM", "{B408B98A-E888-4ECF-81E0-7A37A6854B17}"

 EndProject

@@ -826,4 +826,7 @@
 		{4EC107AB-89E8-4A0B-8366-B3E81085AE07} = {ED25C308-5BDB-43A7-BED6-C2C059FC2D7D}

 		{CF8EBC89-8762-49DC-9440-6C82B3499913} = {ED25C308-5BDB-43A7-BED6-C2C059FC2D7D}

 	EndGlobalSection

+	GlobalSection(ExtensibilityGlobals) = postSolution

+		SolutionGuid = {4DF423D2-8425-48A7-9CEC-835C4C3CA957}

+	EndGlobalSection

 EndGlobal