Tweak 64-bit integer type declarations; Fixes GCC sysutil build

breakage.

include/sys/types.h

@@ -69,12 +69,7 @@ typedef char            i8_t;      /* 8 bit signed type */
 typedef short          i16_t;      /* 16 bit signed type */
 typedef long           i32_t;      /* 32 bit signed type */
 
-#ifdef __LONG_LONG_SUPPORTED
-typedef unsigned long long     u64_t; /* 64 bit type */
-typedef long long              i64_t; /* 64 bit signed type */
-#else
 typedef struct { u32_t _[2]; } u64_t;
-#endif
 
 /* The following types are needed because MINIX uses K&R style function
  * definitions (for maximum portability).  When a short, such as dev_t, is