package/libvips: remove unrecognized --enable-cxx

Remove --enable-cxx, this option has been removed since version 8.1 and
https://github.com/libvips/libvips/commit/346a9e70c0b096f84127449488e7dce6968d91c7

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libvips/libvips.mk

@@ -41,10 +41,6 @@ LIBVIPS_DEPENDENCIES = \
 	host-pkgconf expat libglib2 \
 	$(TARGET_NLS_DEPENDENCIES)
 
-# --disable-cxx is broken upstream
-# https://github.com/jcupitt/libvips/issues/231
-LIBVIPS_CONF_OPTS += --enable-cxx
-
 ifeq ($(BR2_PACKAGE_JPEG),y)
 LIBVIPS_CONF_OPTS += --with-jpeg
 LIBVIPS_DEPENDENCIES += jpeg