Corrections of cmake files
diff --git a/lib/decoding/osmocom/coding/CMakeLists.txt b/lib/decoding/osmocom/coding/CMakeLists.txt
index 615a2f6..8e68577 100644
--- a/lib/decoding/osmocom/coding/CMakeLists.txt
+++ b/lib/decoding/osmocom/coding/CMakeLists.txt
@@ -17,7 +17,7 @@
 # the Free Software Foundation, Inc., 51 Franklin Street,
 # Boston, MA 02110-1301, USA.
 
-add_sources(APPEND grgsm_sources
+add_sources(
     gsm0503_conv.c
     gsm0503_coding.c
     gsm0503_interleaving.c