Bug#913806: libc-bin: parsing of ld.so.conf by ldconfig and ld differs
According to the current code of ldconfig and ld, there's subtle
difference in parsing of /etc/ld.so.conf by these two tools:
* ldconfig interprets relative paths in includes relatively to the
current directory it run in, and absolute path relatively to the
current "chroot" directory, if set
* ld interprets relative paths in includes relatively to the directory
the parsed file is in, and apparently ignores the --sysroot setting
for absolute paths and does not relativise them to this sysroot.
dpkg-shlibdeps follows ldconfig, but always takes absolute paths
relatively to the absolute root.
Also, ldconfig's manpage doesn't mention include directive at all