Update V8 to r5388 as required by WebKit r66666

Change-Id: Ib3c42e9b7226d22c65c7077c543fe31afe62a318
diff --git a/src/version.cc b/src/version.cc
index ecee6eb..1afcaf2 100644
--- a/src/version.cc
+++ b/src/version.cc
@@ -33,10 +33,10 @@
 // NOTE these macros are used by the SCons build script so their names
 // cannot be changed without changing the SCons build script.
 #define MAJOR_VERSION     2
-#define MINOR_VERSION     3
-#define BUILD_NUMBER      10
+#define MINOR_VERSION     4
+#define BUILD_NUMBER      1
 #define PATCH_LEVEL       0
-#define CANDIDATE_VERSION false
+#define CANDIDATE_VERSION true
 
 // Define SONAME to have the SCons build the put a specific SONAME into the
 // shared library instead the generic SONAME generated from the V8 version