* emacs.c [!defined CANNOT_DUMP]: Include unexec.h.
* unexaix.c, unexcoff.c, unexcw.c, unexelf.c, unexhp9k800.c:
* unexmacosx.c, unexsol.c, unexw32.c: Include unexec.h.
+ Change as necessary to match prototype in unexec.h.
* syntax.c (Fforward_comment, scan_lists): Rename locals to avoid
shadowing.