pandaboard: remove use of gcc 4.6.x

Gcc 4.6.x is legacy now; remove version specification from the config file to
repair the build.

Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

configs/pandaboard_defconfig

@@ -28,9 +28,6 @@ BR2_LINUX_KERNEL_USE_INTREE_DTS=y
 # might need omap4-panda or omap4-panda-a4 instead
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="omap4-panda-es"
 
-# GCC
-BR2_GCC_VERSION_4_6_X=y
-
 # Bootloaders
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_FORMAT_IMG=y