util: drop HAVE_CLOCK_GETRES_MONOTONIC configure constant

It doesn't provide a significant benefit over just trying the call.
It was added by 6bd3f08 for Hurd support.

configure.ac

@@ -236,25 +236,12 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
                     ]
                  )
 
+# Checks for library functions
 AX_SAVE_FLAGS
 LIBS="$LIBS $rt_LIBS"
-AC_MSG_CHECKING(for a working clock_getres(CLOCK_MONOTONIC, &ts))
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
-[[#include <time.h>]],
-[[struct timespec ts; if(clock_getres(CLOCK_MONOTONIC, &ts)) return -1;]])],
-                    [
-                      AC_MSG_RESULT([yes])
-                      AC_DEFINE_UNQUOTED([HAVE_CLOCK_GETRES_MONOTONIC], 1, [Define to 1 if clock_getres(CLOCK_MONOTONIC, &ts) works])
-                    ],
-                    [
-                      AC_MSG_RESULT([no])
-                    ]
-                 )
 AC_CHECK_FUNCS([clock_gettime])
 AX_RESTORE_FLAGS
 
-
-# Checks for library functions
 AC_FUNC_CHOWN
 AC_FUNC_FORK
 AC_FUNC_MMAP

lib/util.c

@@ -194,12 +194,10 @@ qb_util_nano_monotonic_hz(void)
 	uint64_t nano_monotonic_hz;
 	struct timespec ts;
 
-#if HAVE_CLOCK_GETRES_MONOTONIC
-	clock_getres(CLOCK_MONOTONIC, &ts);
-#else
-	if (clock_getres(CLOCK_REALTIME, &ts) != 0)
-	    qb_util_perror(LOG_ERR,"CLOCK_REALTIME");
-#endif
+	if ((clock_getres(CLOCK_MONOTONIC, &ts) != 0)
+		&& (clock_getres(CLOCK_REALTIME, &ts) != 0)) {
+		qb_util_perror(LOG_ERR, "couldn't get clock resolution");
+	}
 
 	nano_monotonic_hz =
 	    QB_TIME_NS_IN_SEC / ((ts.tv_sec * QB_TIME_NS_IN_SEC) + ts.tv_nsec);