Drop libglib and libgio dependencies from libsysprof-capture
As discussed on glib!1551 (merged), to allow libsysprof-capture to be used in libglib, it needs to drop its dependencies to POSIX-only.
As discussed on glib!1551 (merged), to allow libsysprof-capture to be used in libglib, it needs to drop its dependencies to POSIX-only.