Make vrt.h include <stddef.h> and <stdint.h>

Originally we decided that the output of VCC should be 100%
stand-alone and therefore contain no #includes at all.  This
was hoped to avoid unspecified trouble with C-compilers at runtime.

But C99 is old enough to drink now, so we move forward.

The script in tools/include_wash.py checks *.c files and
complains about violations of our intended #include orders.

tools/include_wash.py

+#!/usr/bin/env python
+
+from __future__ import print_function
+
+import os
+
+def check(fn):
+	l = []
+	for i in open(fn):
+		i = i.strip()
+		if len(i) == 0:
+			continue
+		if i[0] != "#":
+			continue
+		if i.find("include") == -1:
+			continue
+		if i.find('"') == -1:
+			l.append(i.split('<')[1].split('>')[0])
+		else:
+			l.append(i.split('"')[1])
+	if "vrt.h" in l:
+		vrt = l.index("vrt.h")
+		if not "vdef.h" in l:
+			print(fn, "vdef.h not included with vrt.h")
+		vdef = l.index("vdef.h")
+		if vdef > vrt:
+			print(fn, "vdef.h included after vrt.h")
+		for i in ("stddef.h", "stdint.h", "cache/cache.h", "cache.h"):
+			if i in l:
+				print(fn, i + " included with vrt.h")
+		
+	for i in ("cache/cache.h", "cache.h"):
+		if i in l:
+			for i in (
+			    "stddef.h", "stdint.h", "vrt.h",
+			    "math.h", "pthread.h", "stdarg.h", "sys/types.h",
+			    "vdef.h", "miniobj.h", "vas.h", "vqueue.h",
+			):
+				if i in l:
+					print(fn, i + " included with cache.h")
+
+for (dir, dns, fns) in os.walk("."):
+	for f in fns:
+		if f[-2:] == ".c":
+			check(dir + "/" + f)