Revert "gcc/gcc-final: pass TARGET_ABI flags to configure with --enable-cxx-flags"

This reverts commit 2dcab526a97d1dbcb73c3cd578e5bf2853853a10.

Now that gcc correctly propagates CXXFLAGS_FOR_TARGET for libstdc++
build this is no longer needed.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gcc/gcc-final/gcc-final.mk

@@ -195,8 +195,4 @@ endef
 HOST_GCC_FINAL_POST_INSTALL_HOOKS += HOST_GCC_FINAL_INSTALL_USR_LIBS
 endif
 
-ifeq ($(BR2_xtensa),y)
-HOST_GCC_FINAL_CONF_OPTS += --enable-cxx-flags="$(TARGET_ABI)"
-endif
-
 $(eval $(host-autotools-package))