Avoid using echo -n anywhere

`echo -n` is non-portable. The POSIX specification says:

    Conforming applications that wish to do prompting without <newline>
    characters or that could possibly be expecting to echo a -n, should
    use the printf utility derived from the Ninth Edition system.

Since all of the affected shell scripts use a POSIX shell shebang,
replace `echo -n` invocations with printf.

Signed-off-by: Lukas Fleischer <git@cryptocrack.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/perf/perf-lib.sh

@@ -160,7 +160,7 @@ test_perf () {
 		echo "$test_count" >>"$perf_results_dir"/$base.subtests
 		echo "$1" >"$perf_results_dir"/$base.$test_count.descr
 		if test -z "$verbose"; then
-			echo -n "perf $test_count - $1:"
+			printf "%s" "perf $test_count - $1:"
 		else
 			echo "perf $test_count - $1:"
 		fi
@@ -169,7 +169,7 @@ test_perf () {
 			if test_run_perf_ "$2"
 			then
 				if test -z "$verbose"; then
-					echo -n " $i"
+					printf " %s" "$i"
 				else
 					echo "* timing run $i/$GIT_PERF_REPEAT_COUNT:"
 				fi