build: Fix not checking readline.h for bluetooth-player
build: Fix not checking readline.h for bluetooth-player

If --disable-client is passed to configure script is possible to build
BlueZ without readline which would cause the following error:

tools/bluetooth-player.c:36:31: fatal error: readline/readline.h: No such file or directory
 #include <readline/readline.h>
                               ^

silent-snowman/bluez,silent-snowman/bluez,pkarasev3/bluez,ComputeCycles/bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,ComputeCycles/bluez,pkarasev3/bluez,mapfau/bluez,mapfau/bluez,pkarasev3/bluez,pkarasev3/bluez,ComputeCycles/bluez,pstglia/external-bluetooth-bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,silent-snowman/bluez