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add intmax_t/uintmax_t as required by c99 7.18.1.5

--- a/sys/include/ape/stdint.h

+++ b/sys/include/ape/stdint.h

@@ -14,10 +14,12 @@

 typedef short int16_t;

 typedef int int32_t;

 typedef long long int64_t;

+typedef long long intmax_t;

 typedef unsigned char uint8_t;

 typedef unsigned short uint16_t;

 typedef unsigned int uint32_t;

 typedef unsigned long long uint64_t;

+typedef unsigned long long uintmax_t;

 typedef _intptr_t intptr_t;

 typedef _uintptr_t uintptr_t;

@@ -36,11 +38,13 @@

 #define INT16_MAX	0x7fff

 #define INT32_MAX	0x7fffffff

 #define INT64_MAX	0x7fffffffffffffffULL

+#define INTMAX_MAX	INT64_MAX

 #define UINT8_MAX	0xff

 #define UINT16_MAX	0xffff

 #define UINT32_MAX	0xffffffffL

 #define UINT64_MAX	0xffffffffffffffffULL

+#define UINTMAX_MAX	UINT64_MAX

 /* 

  * Right now, all of our size_t types are 32 bit, even on