Merge branch 'sg/test-bash-version-fix'

The test suite tried to see if it is run under bash, but the check
itself failed under some other implementations of shell (notably
under NetBSD).  This has been corrected.

* sg/test-bash-version-fix:
  test-lib: check Bash version for '-x' without using shell arrays

t/test-lib.sh

@@ -323,12 +323,12 @@ do
 		# this test is marked as such, and ignore '-x' if it
 		# isn't executed with a suitable Bash version.
 		if test -z "$test_untraceable" || {
-		     test -n "$BASH_VERSION" && {
+		     test -n "$BASH_VERSION" && eval '
 		       test ${BASH_VERSINFO[0]} -gt 4 || {
 			 test ${BASH_VERSINFO[0]} -eq 4 &&
 			 test ${BASH_VERSINFO[1]} -ge 1
 		       }
-		     }
+		     '
 		   }
 		then
 			trace=t