Support syscalls of kernel 5.4

I have looked at https://sourceware.org/git/?p=glibc.git;a=history;f=sysdeps/unix/sysv/linux/syscall-names.list;h=HEAD;hb=HEAD
and it seems that we do not support quite a lot of syscalls

We loose ability to run in chroots/containers on CentOS 8, but it is probably not a big problem for us right now
(ROSA is not a populer distro for contaienrs unfortunately)
and, I think, it is better to support newer syscalls than try to support strange hosts of containers.
We do not support RHEL 7 hosts now (they have kernel 3.10, but we require 4.0+).

Both rosa2019.1 and RHEL 9 with a newer kernel will be released soon

Discussed with and approved by fedya@.
He also said that older kernels are not required on aarch64.

glibc.spec

@@ -59,25 +59,7 @@
 %define xenarches %{ix86}
 
 # Determine minimum kernel versions (rhbz#619538)
-%ifarch %{arm}
-# currently using 3.0.35 kernel with wandboard
-%define enablekernel 3.0.35
-%else
-%ifarch %{aarch64}
-# Before increasing, please make sure all
-# boxes we support can be updated:
-# As of 2020/07/15:
-# Synquacer, Macchiatobin and friends have mainline
-# Rockchip 3399 has 4.4.x
-# Gemini PDA has 3.18.x
-# Nexus 5X has 3.10.x
-%define enablekernel 3.10.0
-%else
-# (tpg) some popular clouds will fail with error "FATAL: kernel too old"
-# when running our docker or building it. Let's be safe and pretend it's 2015.
-%define enablekernel 4.0
-%endif
-%endif
+%define enablekernel 5.4
 
 # Define to build nscd with selinux support
 # Distro-specific default value is defined in branding-configs package
@@ -115,7 +97,7 @@ Source0:	http://ftp.gnu.org/gnu/glibc/%{oname}-%{ver}.tar.xz
 #if %(test $(echo %{version}.0 |cut -d. -f3) -lt 90 && echo 1 || echo 0)
 #Source1:	http://ftp.gnu.org/gnu/glibc/%{oname}-%{ver}.tar.xz.sig
 #endif
-Release:	2
+Release:	3
 License:	LGPLv2+ and LGPLv2+ with exceptions and GPLv2+
 Group:		System/Libraries
 Url:		http://www.gnu.org/software/libc/