bpo-28791: Update Windows builds to use SQLite 3.21.0. (GH-4246)

Misc/NEWS.d/next/Build/2017-11-02-20-30-57.bpo-28791.VaE3o8.rst

+Update Windows builds to use SQLite 3.21.0.

PCbuild/get_externals.bat

@@ -50,7 +50,7 @@ echo.Fetching external libraries...
 set libraries=
 set libraries=%libraries%                                       bzip2-1.0.6
 if NOT "%IncludeSSLSrc%"=="false" set libraries=%libraries%     openssl-1.1.0f
-set libraries=%libraries%                                       sqlite-3.14.2.0
+set libraries=%libraries%                                       sqlite-3.21.0.0
 if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tcl-core-8.6.6.0
 if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tk-8.6.6.0
 if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tix-8.4.3.6

PCbuild/python.props

@@ -44,7 +44,7 @@
     
     <!-- Directories of external projects. tcltk is handled in tcltk.props -->
     <ExternalsDir>$([System.IO.Path]::GetFullPath(`$(PySourcePath)externals\`))</ExternalsDir>
-    <sqlite3Dir>$(ExternalsDir)sqlite-3.14.2.0\</sqlite3Dir>
+    <sqlite3Dir>$(ExternalsDir)sqlite-3.21.0.0\</sqlite3Dir>
     <bz2Dir>$(ExternalsDir)bzip2-1.0.6\</bz2Dir>
     <lzmaDir>$(ExternalsDir)xz-5.2.2\</lzmaDir>
     <opensslDir>$(ExternalsDir)openssl-1.1.0f\</opensslDir>

PCbuild/readme.txt

@@ -182,7 +182,7 @@ _ssl
     again when building.
 
 _sqlite3
-    Wraps SQLite 3.14.2.0, which is itself built by sqlite3.vcxproj
+    Wraps SQLite 3.21.0.0, which is itself built by sqlite3.vcxproj
     Homepage:
         http://www.sqlite.org/
 _tkinter