add HH-suite easyconfigs for gnu toolchains

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
fix version literal in sources

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
Merge pull request #219 from fgeorgatos/contrib_HH-suite

add HH-suite easyconfigs for gnu toolchains