ncurses: Silence -Wunused-but-set-variable for various files.

Presumably these will be fixed upstream eventually.

Differential Revision:	https://reviews.freebsd.org/D40664

lib/ncurses/form/Makefile

@@ -57,6 +57,8 @@ CLEANFILES=	ncurses_def.h
 CFLAGS+=	-I${SRCDIR}
 CFLAGS+=	-I${NCURSES_DIR}/menu
 
+CWARNFLAGS.fty_enum.c= ${NO_WUNUSED_BUT_SET_VARIABLE}
+
 LIBADD+=	ncursesw
 
 INCS=	form.h

lib/ncurses/ncurses/Makefile

@@ -147,6 +147,8 @@ DBGSRCS= \
 
 CLEANFILES=	${GENSRCS}
 
+CWARNFLAGS.lib_set_term.c= ${NO_WUNUSED_BUT_SET_VARIABLE}
+
 .if ${MK_INSTALLLIB} != "no"
 SYMLINKS+=	libncursesw.a ${LIBDIR}/libcursesw.a
 # backward compat

lib/ncurses/tinfo/Makefile

@@ -167,6 +167,9 @@ CLEANFILES=	${GENSRCS} ${GENHDRS} keys.list make_hash term.h.new \
 
 CFLAGS+=	-DTERMIOS
 
+CWARNFLAGS.comp_parse.c= ${NO_WUNUSED_BUT_SET_VARIABLE}
+CWARNFLAGS.read_entry.c= ${NO_WUNUSED_BUT_SET_VARIABLE}
+
 # Installed
 HEADERS=	curses.h term.h termcap.h unctrl.h
 SRCHDRS=	ncurses_dll.h