Update capnpc-capnp to use KJ_MAIN.

c++/src/capnp/compiler/capnp.c++

@@ -41,6 +41,12 @@
 #include <capnp/serialize-packed.h>
 #include <limits>
 
+#if HAVE_CONFIG_H
+#include "config.h"
+#else
+#define VERSION "(unknown ekam build)"
+#endif
+
 namespace capnp {
 namespace compiler {
 
@@ -65,7 +71,7 @@ public:
   }
 };
 
-static const char VERSION_STRING[] = "Cap'n Proto version 0.2";
+static const char VERSION_STRING[] = "Cap'n Proto version " VERSION;
 
 class CompilerMain final: public GlobalErrorReporter {
 public:

c++/src/kj/array.h

@@ -350,6 +350,11 @@ public:
   template <typename Iterator>
   void addAll(Iterator start, Iterator end);
 
+  void removeLast() {
+    KJ_IREQUIRE(pos > ptr, "No elements present to remove.");
+    kj::dtor(*--pos);
+  }
+
   Array<T> finish() {
     // We could safely remove this check if we assume that the disposer implementation doesn't
     // need to know the original capacity, as is thes case with HeapArrayDisposer since it uses

c++/src/kj/vector.h

@@ -87,6 +87,10 @@ public:
     addAll(container.begin(), container.end());
   }
 
+  inline void removeLast() {
+    builder.removeLast();
+  }
+
 private:
   ArrayBuilder<T> builder;