bluetoothd: don't export internal API

... when building without external plugins.

Makefile.am

@@ -289,7 +289,6 @@ pkglibexec_PROGRAMS += src/bluetoothd
 
 src_bluetoothd_SOURCES = $(builtin_sources) \
 			$(attrib_sources) $(btio_sources) \
-			src/bluetooth.ver \
 			src/main.c src/log.h src/log.c \
 			src/backtrace.h src/backtrace.c \
 			src/rfkill.c src/btd.h src/sdpd.h \
@@ -321,8 +320,12 @@ src_bluetoothd_LDADD = lib/libbluetooth-internal.la \
 			src/libshared-glib.la \
 			$(BACKTRACE_LIBS) $(GLIB_LIBS) $(DBUS_LIBS) -ldl -lrt \
 			$(builtin_ldadd)
+
+if EXTERNAL_PLUGINS
+src_bluetoothd_SOURCES += src/bluetooth.ver
 src_bluetoothd_LDFLAGS = $(AM_LDFLAGS) -Wl,--export-dynamic \
 				-Wl,--version-script=$(srcdir)/src/bluetooth.ver
+endif
 
 src_bluetoothd_CPPFLAGS = $(AM_CPPFLAGS) -DBLUETOOTH_PLUGIN_BUILTIN \
 					-DPLUGINDIR=\""$(build_plugindir)"\" \