r307679: buildworkd failure: error: expected function body after function declarator extern NCURSES_EXPORT_VAR(chtype)

Recent CURRENT fails to buildworld.

It also crashes on a regular basis since 307157.

[...]
===> lib/ncurses/ncursesw (obj,build-tools)
Building /usr/obj/usr/src/lib/ncurses/ncursesw/make_hash
In file included
from /usr/src/lib/ncurses/ncursesw/../../../contrib/ncurses/ncurses/tinfo/make_hash.c:40:
In file included
from /usr/src/lib/ncurses/ncursesw/../../../contrib/ncurses/ncurses/build.priv.h:69: ./curses.h:276:35:
error: expected function body after function declarator extern NCURSES_EXPORT_VAR(chtype)
acs_map[]; ^ ./curses.h:577:28: error: expected function body after function declarator
extern NCURSES_EXPORT(int) addch (const chtype);                        /* generated */
                           ^
./curses.h:578:28: error: expected function body after function declarator
extern NCURSES_EXPORT(int) addchnstr (const chtype *, int);             /* generated */
                           ^
./curses.h:579:28: error: expected function body after function declarator
extern NCURSES_EXPORT(int) addchstr (const chtype *);                   /* generated */
                           ^
./curses.h:580:28: error: expected function body after function declarator
extern NCURSES_EXPORT(int) addnstr (const char *, int);                 /* generated */
                           ^
./curses.h:581:28: error: expected function body after function declarator
extern NCURSES_EXPORT(int) addstr (const char *);                       /* generated */
                           ^
./curses.h:582:28: error: expected function body after function declarator
extern NCURSES_EXPORT(int) attroff (NCURSES_ATTR_T);                    /* generated */