src: remove STATIC_ASSERT() macro

This macro does not not rightfully belong in node.h, remove it.
Replace the one use site with a C++11 `static_assert` construct.

src/node.h

@@ -148,14 +148,6 @@ NODE_EXTERN v8::Handle<v8::Value> MakeCallback(
 #define NODE_STRINGIFY_HELPER(n) #n
 #endif
 
-#ifndef STATIC_ASSERT
-#if defined(_MSC_VER)
-#  define STATIC_ASSERT(expr) static_assert(expr, "")
-# else
-#  define STATIC_ASSERT(expr) static_cast<void>((sizeof(char[-1 + !!(expr)])))
-# endif
-#endif
-
 #ifdef _WIN32
 // TODO(tjfontaine) consider changing the usage of ssize_t to ptrdiff_t
 #if !defined(_SSIZE_T_) && !defined(_SSIZE_T_DEFINED)

src/node_v8_platform.cc

@@ -101,7 +101,8 @@ void Platform::WorkerBody(void* arg) {
 TaskQueue::TaskQueue() {
   int err;
 
-  STATIC_ASSERT(kRingSize == (kRingSize & (~(kRingSize - 1))));
+  static_assert(kRingSize == (kRingSize & (~(kRingSize - 1))),
+                "kRingSize is not a power of two");
 
   size_ = kRingSize;
   ring_ = new Task*[size_];