Assume that struct stat contains st_blksize, st_blocks, and st_rdev

Our test suite already assumes that struct stat contains st_blksize,
st_blocks, and st_rdev members, and there haven't been any complaints.

* configure.ac (AC_CHECK_MEMBERS): Remove struct stat.st_blksize,
struct stat.st_blocks, and struct stat.st_rdev.
* printstat.h (DO_PRINTSTAT): Do not check for
HAVE_STRUCT_STAT_ST_BLKSIZE, HAVE_STRUCT_STAT_ST_BLOCKS,
and HAVE_STRUCT_STAT_ST_RDEV.
diff --git a/configure.ac b/configure.ac
index 985bf07..d302afb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -337,14 +337,11 @@
 
 AC_CHECK_MEMBERS(m4_normalize([
 	struct stat.st_atim.tv_nsec,
-	struct stat.st_blksize,
-	struct stat.st_blocks,
 	struct stat.st_ctim.tv_nsec,
 	struct stat.st_flags,
 	struct stat.st_fstype,
 	struct stat.st_gen,
-	struct stat.st_mtim.tv_nsec,
-	struct stat.st_rdev
+	struct stat.st_mtim.tv_nsec
 ]))
 
 AC_CHECK_MEMBERS([struct timex.tai],,, [#include <sys/timex.h>])