en/decoding: fix deprecated include path

The file gprs/protocol/gsm_04_60.h is deprecated, now it is recommended
to use gsm/protocol/gsm_44_060.h

Change-Id: I870e446ad8f371e13bbdb4034feae1260c874ee5
diff --git a/src/encoding.cpp b/src/encoding.cpp
index 370dbe2..243c874 100644
--- a/src/encoding.cpp
+++ b/src/encoding.cpp
@@ -25,7 +25,7 @@
 #include <egprs_rlc_compression.h>
 
 extern "C" {
-#include <osmocom/gprs/protocol/gsm_04_60.h>
+#include <osmocom/gsm/protocol/gsm_44_060.h>
 #include <osmocom/gsm/protocol/gsm_04_08.h>
 #include <osmocom/gsm/gsm48.h>
 }