Fixes problems with program running when compiled with ARM Compiler 5.1.1

diff --git a/rpp-lib b/rpp-lib
index f6138bc6b104c52db50971c13049ed7b5eaf66d3..78af970551012861151f1ef857a24ad8f4a8c61d 160000 (submodule)
--- a/rpp-lib
+++ b/rpp-lib
@@ -1 +1 @@
-Subproject commit f6138bc6b104c52db50971c13049ed7b5eaf66d3
+Subproject commit 78af970551012861151f1ef857a24ad8f4a8c61d