build: Add nobase to the nodist_include_HEADERS

Replace nodist_include_HEADERS with nobase_nodist_include_HEADERS
so that the header files retain their directory structure.
Without it, phosphor-logging/elog-errors.hpp for example installs
in usr/include/ instead of usr/include/phosphor-logging/.

Change-Id: Ib2df7d93fd191316f03e4636ee453030d5a318f4
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
1 file changed