build,pkg-config: expose build features in qmi-glib.pc file
Expose QMI_QRTR_SUPPORTED and QMI_MBIM_QMUX_SUPPORTED so clients of this library can know if the library supports those features.
Expose QMI_QRTR_SUPPORTED and QMI_MBIM_QMUX_SUPPORTED so clients of this library can know if the library supports those features.