Revert "Remove support for MSVC"

sky/engine/wtf/text/WTFString.cpp

Index: sky/engine/wtf/text/WTFString.cpp
diff --git a/sky/engine/wtf/text/WTFString.cpp b/sky/engine/wtf/text/WTFString.cpp
index dfffa6a21ff7887deff386116f976c7192f653b2..e23f7286a6f66ff9dc3003e4fe0c16ef1dc5c902 100644
--- a/sky/engine/wtf/text/WTFString.cpp
+++ b/sky/engine/wtf/text/WTFString.cpp
@@ -469,6 +469,9 @@ String String::format(const char *format, ...)
     Vector<char, 256> buffer;
 
     // Do the format once to get the length.
+#if COMPILER(MSVC)
+    int result = _vscprintf(format, args);
+#else
     char ch;
     int result = vsnprintf(&ch, 1, format, args);
     // We need to call va_end() and then va_start() again here, as the
@@ -479,6 +482,7 @@ String String::format(const char *format, ...)
     // systems, but fails e.g. on 64bit Linux.
     va_end(args);
     va_start(args, format);
+#endif
 
     if (result == 0)
         return String("");
@@ -1011,9 +1015,18 @@ static inline IntegralType toIntegralType(const CharType* data, size_t length, b
         ++data;
     }
 
+#if COMPILER(MSVC)
+#pragma warning(push, 0)
+#pragma warning(disable:4146)
+#endif
+
     if (isNegative)
         value = -value;
 
+#if COMPILER(MSVC)
+#pragma warning(pop)
+#endif
+
     // skip trailing space
     while (length && isSpaceOrNewline(*data)) {
         --length;