core/conv: rename viterbi_gen.c to viterbi_generic.c

Let's avoid confusion with generated files which have
ending with _gen.* as well.

Change-Id: I3ecd8f9e73c05236f2cdc186f58b3d0ba552283f
diff --git a/src/Makefile.am b/src/Makefile.am
index a0aa5a0..e3a0f00 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -21,7 +21,7 @@
 			 conv.c application.c rbtree.c strrb.c \
 			 loggingrb.c crc8gen.c crc16gen.c crc32gen.c crc64gen.c \
 			 macaddr.c stat_item.c stats.c stats_statsd.c prim.c \
-			 viterbi.c viterbi_gen.c sercomm.c
+			 viterbi.c viterbi_generic.c sercomm.c
 
 if HAVE_SSE3
 libosmocore_la_SOURCES += viterbi_sse.c