fltk: drop custom install options

The fltk buildsystem no longer tries to strip binaries during installation,
so these can be dropped.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/fltk/fltk.mk

@@ -8,8 +8,6 @@ FLTK_VERSION = 1.3.2
 FLTK_SOURCE = fltk-$(FLTK_VERSION)-source.tar.gz
 FLTK_SITE = http://fltk.org/pub/fltk/$(FLTK_VERSION)
 FLTK_INSTALL_STAGING = YES
-FLTK_INSTALL_STAGING_OPT = DESTDIR=$(STAGING_DIR) STRIP=$(TARGET_STRIP) install
-FLTK_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) STRIP=$(TARGET_STRIP) install
 FLTK_CONF_OPT = --enable-threads --with-x --disable-gl \
 	--disable-localjpeg --disable-localpng --disable-localzlib
 FLTK_DEPENDENCIES = jpeg libpng xlib_libX11 xlib_libXext xlib_libXt