Build tftpboot and nonlinux on x86_64

RHEL 10 and later, including ELN, no longer build for i686.  The tftpboot
and nonlinux artifacts can be built on x86_64 with glibc32 and gcc -m32,
with both mingw32-gcc and mingw64-gcc to produce both EXEs.

Resolves: RHEL-49795

syslinux.spec

@@ -10,7 +10,7 @@ Summary: Simple kernel loader which boots from a FAT filesystem
 Name: syslinux
 Version: 6.04
 %define tarball_version 6.04-pre1
-Release: 0.28%{?dist}
+Release: 0.29%{?dist}
 License: GPL-2.0-or-later
 URL: http://syslinux.zytor.com/wiki/index.php/The_Syslinux_Project
 Source0: http://www.kernel.org/pub/linux/utils/boot/syslinux/%{name}-%{tarball_version}.tar.xz
@@ -44,7 +44,7 @@ BuildRequires: mingw32-gcc
 %endif
 %ifarch x86_64
 Requires: mtools, libc.so.6()(64bit)
-BuildRequires: mingw64-gcc
+BuildRequires: mingw32-gcc mingw64-gcc
 %endif
 
 # NOTE: extlinux belongs in /sbin, not in /usr/sbin, since it is typically
@@ -79,7 +79,7 @@ Requires: syslinux-extlinux-nonlinux = %{version}-%{release}
 The EXTLINUX bootloader, for booting the local system, as well as all
 the SYSLINUX/PXELINUX modules in /boot.
 
-%ifarch %{ix86}
+%ifarch x86_64
 %package tftpboot
 Summary: SYSLINUX modules in /tftpboot, available for network booting
 BuildArch: noarch
@@ -215,7 +215,7 @@ rm -f %{buildroot}%{_includedir}/syslinux.h
 %{_mandir}/man1/extlinux*
 %config /etc/extlinux.conf
 
-%ifarch %{ix86}
+%ifarch x86_64
 %files tftpboot
 /tftpboot
 
@@ -262,6 +262,9 @@ fi
 %endif
 
 %changelog
+* Tue Jul 23 2024 Yaakov Selkowitz <yselkowi@redhat.com> - 6.04-0.29
+- Build tftpboot and nonlinux on x86_64
+
 * Thu Jul 11 2024 Michal Josef Špaček <mspacek@redhat.com> - 6.04-0.28
 - Rewrite Digest::SHA1 to SHA