src/Makefile.am: add conv_acc_neon_impl.h to EXTRA_DIST

Change-Id: I641c25f8aec249df43c781debfc967f07e221b9d
diff --git a/src/Makefile.am b/src/Makefile.am
index be09784..c2847ec 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -54,7 +54,7 @@
 endif
 
 BUILT_SOURCES = crc8gen.c crc16gen.c crc32gen.c crc64gen.c
-EXTRA_DIST = conv_acc_sse_impl.h crcXXgen.c.tpl
+EXTRA_DIST = conv_acc_sse_impl.h conv_acc_neon_impl.h crcXXgen.c.tpl
 
 libosmocore_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined