Include sysroots from Debian 6 up to 9 #85

Job	Run time
Native build	3h 9m 48s
Cross build (ia64-unknown-linux-gnu)	1m 16s
Cross build (alpha-unknown-linux-gnu)	2m 52s
Cross build (x86_64-unknown-linux-gnu)	2m 0s
Cross build (i386-unknown-linux-gnu)	2m 56s
Cross build (arm-unknown-linux-gnueabi)	1m 22s
Cross build (arm-unknown-linux-gnueabihf)	1m 18s
Cross build (hppa-unknown-linux-gnu)	1m 20s
Cross build (aarch64-unknown-linux-gnu)	2m 40s
Cross build (mips-unknown-linux-gnu)	1m 21s
Cross build (mipsel-unknown-linux-gnu)	2m 33s
Cross build (powerpc-unknown-linux-gnu)	2m 18s
Cross build (s390-unknown-linux-gnu)	2m 20s
Cross build (s390x-unknown-linux-gnu)	1m 17s
Cross build (sparc-unknown-linux-gnu)	2m 0s
Cross build (powerpc64le-unknown-linux-gnu)	2m 54s
Cross build (mips64el-unknown-linux-gnuabi64)	1m 18s
	3h 41m 33s

Provide feedback