g_assert_cmpmem and glib 2.46

[Ben Chan]

Hi Aleksander and Dan,

The PCO patches I submitted earlier on used g_assert_cmpmem(), which I
just realized that it is available in glib 2.46 or later.
ModemManager requires glib 2.36 or later.   Given that glib 2.45 was
released about 3 years ago, I wonder if it's time to bump the minimum
glib version. Otherwise, I can update the code not to use
g_assert_cmpmem(). WDYT?

Thanks,
Ben