Revert "package/xenomai: disable obstack support"

This reverts commit e87644cb2abb78c5bf3bd0c3c6955c202e798ef2.

The issue is now fixed in Xenomai, let use Xenomai obstack support
if it's not already available from the libc.

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/xenomai/xenomai.mk

@@ -38,12 +38,6 @@ else
 XENOMAI_CONF_OPTS += --disable-smp
 endif
 
-# Obstack support in Xenomai is broken when the libc doesn't support
-# obstack support itself. Make sure we disable obstack support for all
-# libc since it was removed in uClibc-ng since 1.0.21 release and it's
-# always disabled with Glibc.
-XENOMAI_CONF_OPTS += CFLAGS="$(TARGET_CFLAGS) -DELIDE_CODE"
-
 define XENOMAI_REMOVE_DEVFILES
 	for i in xeno-config xeno-info wrap-link.sh ; do \
 		rm -f $(TARGET_DIR)/usr/bin/$$i ; \