pg_test_timing: Some NLS fixes

The string "% of total" was marked by xgettext to be a c-format, but it
is actually not, so mark up the source to prevent that.

Compute the column widths of the final display dynamically based on the
translated strings, so that translations don't mess up the display
accidentally.

src/bin/pg_test_timing/pg_test_timing.c

@@ -172,13 +172,22 @@ output(uint64 loop_count)
 {
 	int64		max_bit = 31,
 				i;
+	char	   *header1 = _("< us");
+	char	   *header2 = /* xgettext:no-c-format */ _("% of total");
+	char	   *header3 = _("count");
+	int			len1 = strlen(header1);
+	int			len2 = strlen(header2);
+	int			len3 = strlen(header3);
 
 	/* find highest bit value */
 	while (max_bit > 0 && histogram[max_bit] == 0)
 		max_bit--;
 
 	printf(_("Histogram of timing durations:\n"));
-	printf("%6s   %10s %10s\n", _("< us"), _("% of total"), _("count"));
+	printf("%*s   %*s %*s\n",
+		   Max(6, len1), header1,
+		   Max(10, len2), header2,
+		   Max(10, len3), header3);
 
 	for (i = 0; i <= max_bit; i++)
 	{
@@ -186,7 +195,9 @@ output(uint64 loop_count)
 
 		/* lame hack to work around INT64_FORMAT deficiencies */
 		snprintf(buf, sizeof(buf), INT64_FORMAT, histogram[i]);
-		printf("%6ld    %9.5f %10s\n", 1l << i,
-			   (double) histogram[i] * 100 / loop_count, buf);
+		printf("%*ld    %*.5f %*s\n",
+			   Max(6, len1), 1l << i,
+			   Max(10, len2) - 1, (double) histogram[i] * 100 / loop_count,
+			   Max(10, len3), buf);
 	}
 }