Standard GCC Toolchains

Optimized for ARM Cortex-a7 CPUs

GCC Versions:

• GCC 4.8.5
• GCC 4.9.3
• GCC 5.1
• GCC 5.2.0

Allow kernel build with GCC 5.+

• https://github.com/torvalds/linux/commit/71458cfc782eafe4b27656e078d379a34e472adf
• https://github.com/torvalds/linux/commit/51b97e354ba9fce1890cf38ecc754aa49677fc89