component/golang: build with latest slapos gcc
Golang needs a recent enough version of ld (>2.2) and of gcc ( > 5.5 )
This also introduces multiple gcc versions in gcc component, to have finer control over which component uses which version of gcc.
Golang needs a recent enough version of ld (>2.2) and of gcc ( > 5.5 )
This also introduces multiple gcc versions in gcc component, to have finer control over which component uses which version of gcc.