add a header file to solve hexagon error

Author: mkatanbaf

include/tvm/runtime/c_runtime_api.h

@@ -77,15 +77,16 @@ extern "C" {
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <sys/types.h>
 
 #if defined(_MSC_VER)
 #if defined(_WIN64)
-#define tvm_ssize_t int64_t
+typedef int64_t tvm_ssize_t;
 #else
-#define tvm_ssize_t int32_t
+typedef int32_t tvm_ssize_t;
 #endif
 #else
-#define tvm_ssize_t ssize_t
+typedef ssize_t tvm_ssize_t;
 #endif
 
 /*! \brief type of array index. */