Sync version for vc++ 15.9

Author: weltling

win32/build/confutils.js

@@ -75,6 +75,7 @@ VC_VERSIONS[1912] = 'MSVC15 (Visual C++ 2017)';
 VC_VERSIONS[1913] = 'MSVC15 (Visual C++ 2017)';
 VC_VERSIONS[1914] = 'MSVC15 (Visual C++ 2017)';
 VC_VERSIONS[1915] = 'MSVC15 (Visual C++ 2017)';
+VC_VERSIONS[1916] = 'MSVC15 (Visual C++ 2017)';
 
 var VC_VERSIONS_SHORT = new Array();
 VC_VERSIONS_SHORT[1200] = 'VC6';
@@ -92,6 +93,7 @@ VC_VERSIONS_SHORT[1912] = 'VC15';
 VC_VERSIONS_SHORT[1913] = 'VC15';
 VC_VERSIONS_SHORT[1914] = 'VC15';
 VC_VERSIONS_SHORT[1915] = 'VC15';
+VC_VERSIONS_SHORT[1916] = 'VC15';
 
 if (PROGRAM_FILES == null) {
 	PROGRAM_FILES = "C:\\Program Files";