toolchain-external: bump version of Linaro ARM toolchain

The gdb version is 7.11.1 not 7.10 as stated in the link below [1].
See the manifest to check the version really used [2].

Tested with Qemu 2.4.1 and qemu_arm_vexpress_defconfig.

[1] https://releases.linaro.org/components/toolchain/binaries/5.3-2016.05
[2] https://releases.linaro.org/components/toolchain/binaries/5.3-2016.05/arm-linux-gnueabihf/gcc-linaro-5.3.1-2016.05-linux-manifest.txt

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
diff --git a/toolchain/toolchain-external/Config.in b/toolchain/toolchain-external/Config.in
index c3822ed..ab1ccd5 100644
--- a/toolchain/toolchain-external/Config.in
+++ b/toolchain/toolchain-external/Config.in
@@ -39,7 +39,7 @@
 
 # See the note above.
 config BR2_TOOLCHAIN_EXTERNAL_LINARO_ARM
-	bool "Linaro ARM 2016.02"
+	bool "Linaro ARM 2016.05"
 	depends on BR2_arm
 	depends on BR2_ARM_CPU_ARMV7A
 	depends on BR2_HOSTARCH = "x86_64"
@@ -54,8 +54,8 @@
 	select BR2_TOOLCHAIN_HAS_FORTRAN
 	help
 	  Linaro toolchain for the ARM architecture. It uses Linaro
-	  GCC 2016.02 (based on gcc 5.3), Linaro GDB 2016.02 (based on
-	  GDB 7.10), glibc 2.21, Binutils 2015.10 (based on 2.25). It
+	  GCC 2016.05 (based on gcc 5.3.1), Linaro GDB 2016.05 (based on
+	  GDB 7.11.1), glibc 2.21, Binutils 2016.05 (based on 2.25). It
 	  generates code that runs on all Cortex-A profile devices,
 	  but tuned for the Cortex-A9. The code generated is Thumb 2,
 	  with the hard floating point calling convention, and uses