libctf: fix the type of ctf_enum.cte_value

This stops the file format from depending on the size of the host int.
(It does mean that we cannot encode enums with a value > 2^32 on
platforms with an int > 2^32: this will be fixed in the next format
revision.)

include/
	* ctf.h (ctf_enum.cte_value): Fix type to int32_t.

include/ChangeLog

+2019-06-03  Nick Alcock  <nick.alcock@oracle.com>
+
+	* ctf.h (ctf_enum.cte_value): Fix type to int32_t.
+
 2019-05-29  Nick Alcock  <nick.alcock@oracle.com>
 
 	* ctf-api.h (ctf_sect_t): Drop cts_type, cts_flags, and cts_offset.

include/ctf.h

@@ -507,7 +507,7 @@ typedef struct ctf_lmember_v2
 typedef struct ctf_enum
 {
   uint32_t cte_name;		/* Reference to name in string table.  */
-  int cte_value;		/* Value associated with this name.  */
+  int32_t cte_value;		/* Value associated with this name.  */
 } ctf_enum_t;
 
 /* The ctf_archive is a collection of ctf_file_t's stored together. The format