Remove dependency on Vector from platform files

src/utils.h

Index: src/utils.h
diff --git a/src/utils.h b/src/utils.h
index 67b8d79a5f6a586bc1cf1bc4c942798bebc10dcb..a0553d266c5b2b045a6e25f9ed34ba388b16f2b3 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -1164,6 +1164,13 @@ void FPRINTF_CHECKING PrintF(FILE* out, const char* format, ...);
 // Prepends the current process ID to the output.
 void PRINTF_CHECKING PrintPID(const char* format, ...);
 
+// Safe formatting print. Ensures that str is always null-terminated.
+// Returns the number of chars written, or -1 if output was truncated.
+int FPRINTF_CHECKING SNPrintF(Vector<char> str, const char* format, ...);
+int VSNPrintF(Vector<char> str, const char* format, va_list args);
+
+void StrNCpy(Vector<char> dest, const char* src, size_t n);
+
 // Our version of fflush.
 void Flush(FILE* out);