Recognize VC12 (a.k.a. MSVS 2013) and define __VISUALC12__ for it.

Closes #15320.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74479 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/mainpages/const_cpp.h

@@ -157,7 +157,7 @@ compiler used.
                     @c 1020 for @c 4.2 (the first supported version), @c 1100 for
                     @c 5.0, @c 1200 for @c 6.0 and so on. For convenience, the symbols
                     __VISUALCn__ are also defined for each major compiler version from
-                    5 to 11, i.e. you can use tests such @ifdef_ __VISUALC7__ to test
+                    5 to 12, i.e. you can use tests such @ifdef_ __VISUALC7__ to test
                     for compiler version being precisely 7.}
 @itemdef{__XLC__, AIX compiler}
 @itemdef{__WATCOMC__, Watcom C++. The value of this macro corresponds to

include/msvc/wx/setup.h

@@ -62,6 +62,8 @@
         #define wxCOMPILER_PREFIX vc100
     #elif _MSC_VER == 1700
         #define wxCOMPILER_PREFIX vc110
+    #elif _MSC_VER == 1800
+        #define wxCOMPILER_PREFIX vc120
     #else
         #error "Unknown MSVC compiler version, please report to wx-dev."
     #endif

include/wx/platform.h

@@ -456,6 +456,8 @@
 #       define __VISUALC10__
 #   elif __VISUALC__ < 1800
 #       define __VISUALC11__
+#   elif __VISUALC__ < 1900
+#       define __VISUALC12__
 #   else
 #       pragma message("Please update wx/platform.h to recognize this VC++ version")
 #   endif