.checkpackageignore: remove xenomai patches

Xenomai patches have been dropped in commit
44fafcc41aca4c32ecd937c4b7ae93b7a713d9f2, which forgot to update
.checkpackageignore.

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/8192495435

Signed-off-by: Romain Naour <romain.naour@smile.fr>

.checkpackageignore

@@ -1365,9 +1365,6 @@ package/xen/0001-9pfs-include-linux-limits.h-for-XATTR_SIZE_MAX.patch lib_patch.
 package/xen/0002-Fix-build-with-64-bits-time_t.patch lib_patch.Upstream
 package/xen/0003-libs-light-fix-tv_sec-printf-format.patch lib_patch.Upstream
 package/xen/0004-libs-light-fix-tv_sec-fprintf-format.patch lib_patch.Upstream
-package/xenomai/3.0.10/0001-lib-boilerplate-iniparser-Allow-building-with-GCC-10-2-2020101.patch lib_patch.Upstream
-package/xenomai/3.0.10/0002-Add-disable-demo-testsuite-options.patch lib_patch.Upstream
-package/xenomai/3.0.10/0003-lib-cobalt-copperplate-Use-valid-addresses-for-pthread_setspecific.patch lib_patch.Upstream
 package/xinetd/0001-ar.patch lib_patch.Upstream
 package/xinetd/0002-destdir.patch lib_patch.Upstream
 package/xinetd/0003-rpc-fix.patch lib_patch.Upstream