Add support for generating Microsoft Visual Studio 2019 project files.

* build/generator/gen_win_dependencies.py
  (parse_options): Add magic numbers for Visual Studio 2019.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1856397 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/build/generator/gen_win_dependencies.py b/build/generator/gen_win_dependencies.py
index 735ca42..da59599 100644
--- a/build/generator/gen_win_dependencies.py
+++ b/build/generator/gen_win_dependencies.py
@@ -267,6 +267,11 @@
           self.sln_version = '12.00'
           self.vcproj_version = '14.1'
           self.vcproj_extension = '.vcxproj'
+        elif val == '2019' or val == '16':
+          self.vs_version = '2019'
+          self.sln_version = '12.00'
+          self.vcproj_version = '14.2'
+          self.vcproj_extension = '.vcxproj'
         elif re.match('^20\d+$', val):
           print('WARNING: Unknown VS.NET version "%s",'
                 ' assuming VS2012. Your VS can probably upgrade')