Fix two broken Makefiles reported by Gowri at IBM.

Signed-off-by: Gowri <gomuthuk@linux.vnet.ibm.com>
Reviewed-by: Garrett Cooper <yanegomi@gmail.com>
diff --git a/testcases/realtime/perf/Makefile b/testcases/realtime/perf/Makefile
index c9310c3..bf0368d 100644
--- a/testcases/realtime/perf/Makefile
+++ b/testcases/realtime/perf/Makefile
@@ -20,7 +20,7 @@
 # Garrett Cooper, September 2009
 #
 
-top_srcdir		?= ../../../..
+top_srcdir		?= ../../..
 
 include $(top_srcdir)/include/mk/env_pre.mk
 include $(abs_srcdir)/../config.mk
diff --git a/testcases/realtime/stress/Makefile b/testcases/realtime/stress/Makefile
index e57b17b..ad10e69 100644
--- a/testcases/realtime/stress/Makefile
+++ b/testcases/realtime/stress/Makefile
@@ -20,7 +20,7 @@
 # Garrett Cooper, September 2009
 #
 
-top_srcdir		?= ../../../..
+top_srcdir		?= ../../..
 
 include $(top_srcdir)/include/mk/env_pre.mk
 include $(abs_srcdir)/../config.mk