update buildroot to 2017.02.11

bsp/buildroot-2017.02.11/board/olimex/imx233_olinuxino/linux-wifi.fragment

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+# Network testing
+CONFIG_WIRELESS=y
+CONFIG_CFG80211=y
+CONFIG_CFG80211_WEXT=y
+CONFIG_MAC80211=y
+# MII PHY device drivers
+CONFIG_WLAN=y
+CONFIG_RTL8187=m
+CONFIG_ATH9K_HTC=m
+CONFIG_RT2X00=m
+CONFIG_RT73USB=m
+CONFIG_RT2800USB=m
+CONFIG_RT2800USB_RT53XX=y
+CONFIG_RT2800USB_RT55XX=y
+CONFIG_RT2800USB_UNKNOWN=y
+CONFIG_RTL_CARDS=m
+CONFIG_RTL8192CU=m
+CONFIG_ZD1211RW=m

bsp/buildroot-2017.02.11/board/olimex/imx233_olinuxino/readme.txt

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+This configuration is intended as a base image.
+It includes kernel and firmware support for the common USB WiFi hardware.
+Packages for WiFi support are up to the user, you'll probably want
+one or more of: hostapd, iw, wireless_tools and/or wpa_supplicant.
+
+It also pulls up the console on the serial port, not on TV output.
+
+=== Output files after building ==============================================
+
+output/images
++-- boot.vfat (VFAT kernel partition image generated by genimage)
++-- imx23-olinuxino.dtb (device tree blob)
++-- rootfs.ext2 (Root file system)
++-- sdcard.img (Complete SD card image generated by genimage)
++-- u-boot.sd (U-Boot image)
++-- uImage  (Kernel binary)
+
+=== Use of generated SD card image ===========================================
+
+To determine the device associated to the SD card have a look in the
+/proc/partitions file:
+
+  cat /proc/partitions
+
+Then, run the following command as root:
+
+*** WARNING! The command will destroy all the card content. Use with care! ***
+
+ sudo dd if=output/images/sdcard.img of=/dev/<your-microsd-device>