build: Make bt_shell conditional to readline
bt_shell APIs shall only be build if readline is present on the system
since it currently depend on it.
diff --git a/Makefile.am b/Makefile.am
index daf34b6..9c3c171 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -119,7 +119,11 @@
src/shared/gatt-server.h src/shared/gatt-server.c \
src/shared/gatt-db.h src/shared/gatt-db.c \
src/shared/gap.h src/shared/gap.c \
- src/shared/tty.h src/shared/shell.c src/shared/shell.h
+ src/shared/tty.h
+
+if READLINE
+shared_sources += src/shared/shell.c src/shared/shell.h
+endif
src_libshared_glib_la_SOURCES = $(shared_sources) \
src/shared/io-glib.c \
