Extract build configuration into a separate header and move it to the base lib

src/checks.h

Index: src/checks.h
diff --git a/src/checks.h b/src/checks.h
index 54e95728c010c29f678b2c98ae97308b273c3d2c..bc599acb1d136c5c91a2f5934d8954199d2b5463 100644
--- a/src/checks.h
+++ b/src/checks.h
@@ -240,33 +240,6 @@ inline void CheckNonEqualsHelper(const char* file,
 #define CHECK_LE(a, b) CHECK((a) <= (b))
 
 
-// Use C++11 static_assert if possible, which gives error
-// messages that are easier to understand on first sight.
-#if V8_HAS_CXX11_STATIC_ASSERT
-#define STATIC_ASSERT(test) static_assert(test, #test)
-#else
-// This is inspired by the static assertion facility in boost.  This
-// is pretty magical.  If it causes you trouble on a platform you may
-// find a fix in the boost code.
-template <bool> class StaticAssertion;
-template <> class StaticAssertion<true> { };
-// This macro joins two tokens.  If one of the tokens is a macro the
-// helper call causes it to be resolved before joining.
-#define SEMI_STATIC_JOIN(a, b) SEMI_STATIC_JOIN_HELPER(a, b)
-#define SEMI_STATIC_JOIN_HELPER(a, b) a##b
-// Causes an error during compilation of the condition is not
-// statically known to be true.  It is formulated as a typedef so that
-// it can be used wherever a typedef can be used.  Beware that this
-// actually causes each use to introduce a new defined type with a
-// name depending on the source line.
-template <int> class StaticAssertionHelper { };
-#define STATIC_ASSERT(test)                                                    \
-  typedef                                                                     \
-    StaticAssertionHelper<sizeof(StaticAssertion<static_cast<bool>((test))>)> \
-    SEMI_STATIC_JOIN(__StaticAssertTypedef__, __LINE__) V8_UNUSED
-#endif
-
-
 #ifdef DEBUG
 #ifndef OPTIMIZED_DEBUG
 #define ENABLE_SLOW_ASSERTS    1