Move schema.* to schema.capnp.*

compiler/capnpc-c.c

@@ -1,4 +1,4 @@
-#include "schema.h"
+#include "schema.capnp.h"
 
 struct scope {
 	struct capn_tree hdr;

compiler/schema-test.cpp

@@ -1,4 +1,4 @@
-#include "schema.h"
+#include "schema.capnp.h"
 #include <gtest/gtest.h>
 
 static const uint8_t simple_schema[] = {

compiler/schema.capnp.c

@@ -1,4 +1,4 @@
-#include "schema.h"
+#include "schema.capnp.h"
 
 void get_Node(struct Node *s, Node_list l, int i) {
 	Node_ptr p = {capn_getp(l.p, i)};