apt 0.7.14: runtime error: filename too long (tmpdir length)

apt 0.7.14: runtime error: filename too long (tmpdir length)

when the tmpdir dir is longer than 220, there is no files saved in
tmp/sysroots/x86_64-linux/var/lib/apt/lists/ after run apt-get update,
this is because apt-get uses the path as the file name, but the file
name can't be longer than 255 according to /usr/include/linux/limits.h.

[YOCTO #2688]

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>