build: Update supported languages

* Remove Uyghur, which has no active maintainer in the past 6 months
* Add Kurdish

Change-Id: Ic79ca973727885a2498c59730ebec4faee821369
core: arm: Add support for GCC 4.8 and 4.9

Change-Id: I96bffffb4b0e16ef5bcedc85dedc70ca3dc2182f
core: arm: Use -O3 optimization inside TARGET_arm_CFLAGS

Change-Id: I224b62b3dada874d00a90258a1dcffcea09bc029