baylibre-acme: Replace g_close() with close() for now.

This g_close(), the only one in the whole code-base, would unnecessarily
raise the minimum glib version to 2.36.

Thanks to Daniel Glöckner for the report.

This fixes bug #724.

src/hardware/baylibre-acme/protocol.c

@@ -277,7 +277,7 @@ static int read_probe_eeprom(unsigned int addr, struct probe_eeprom *eeprom)
 		return -1;
 
 	rd = read(fd, eeprom_buf, EEPROM_SIZE);
-	g_close(fd, NULL);
+	close(fd);
 	if (rd != EEPROM_SIZE)
 		return -1;