move GSM protocol definitions to include/osmocore/protocol/*
diff --git a/libosmocore/include/osmocore/Makefile.am b/libosmocore/include/osmocore/Makefile.am
index f213230..0211752 100644
--- a/libosmocore/include/osmocore/Makefile.am
+++ b/libosmocore/include/osmocore/Makefile.am
@@ -3,3 +3,5 @@
 		   gsmtap.h
 
 osmocoredir = $(includedir)/osmocore
+
+SUBDIRS = protocol