Drop SEC_HAS_CONTENTS condition from section classification for NaCl layout

This check causes it to refuse an RODATA segment that contains nothing
but .note.gnu.build-id.  The check only ever served to identify a
segment of nothing but read-only SHT_NOBITS sections, which never
happens in practice and would break things in other ways if it did.

BUG= none
TEST= manual
R=sehr@chromium.org

Review URL: https://codereview.chromium.org/56023003
1 file changed