ncurses: get rid of unused BR2_PACKAGE_NCURSES_TARGET_HEADERS handling

The option was removed from Config.in in 58508f39c (ncurses: remove
dedicated target-headers option), so remove it from the makefile as
well.

Reported-by: Ian <reg-ian.ridley-buildroot@hydrix.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -19,7 +19,7 @@
 
 	Updated/fixed packages: busybox, gst-plugins-base,
 	imagemagick, libgail, libglib2, libgtk2, lua, luafilesystem,
-	lzo, netcat, pango, php, pppd, proftpd, qt, samba,
+	lzo, ncurses, netcat, pango, php, pppd, proftpd, qt, samba,
 	startup-notification, swfdec, sysvinit, util-linux
 
 	Removed packages: stunnel

package/ncurses/ncurses.mk

@@ -40,11 +40,8 @@ NCURSES_CONF_OPT = \
 	--enable-echo \
 	--enable-const \
 	--enable-overwrite \
-	--enable-broken_linker
-
-ifneq ($(BR2_PACKAGE_NCURSES_TARGET_HEADERS),y)
-NCURSES_CONF_OPT += --disable-static
-endif
+	--enable-broken_linker \
+	--disable-static
 
 ifneq ($(BR2_ENABLE_DEBUG),y)
 NCURSES_CONF_OPT += --without-debug