time.c: use "unsigned int" for bitfields

Followup to r61870

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61881 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

time.c

@@ -1597,18 +1597,12 @@ localtimew(wideval_t timew, struct vtm *result)
     return result;
 }
 
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
-#define bits_t uint8_t
-#else
-#define bits_t unsigned int
-#endif
 PACKED_STRUCT_UNALIGNED(struct time_object {
     wideval_t timew; /* time_t value * TIME_SCALE.  possibly Rational. */
     struct vtm vtm;
-    bits_t gmt:3; /* 0:localtime 1:utc 2:fixoff 3:init */
-    bits_t tm_got:1;
+    unsigned int gmt:3; /* 0:localtime 1:utc 2:fixoff 3:init */
+    unsigned int tm_got:1;
 });
-#undef bits_t
 
 #define GetTimeval(obj, tobj) ((tobj) = get_timeval(obj))
 #define GetNewTimeval(obj, tobj) ((tobj) = get_new_timeval(obj))