This package fails to build in mock. build.log is attached.
Created attachment 129677 [details] Matt Domsch's build.log
Adding a build requires on glibc-devel allows syslinux to build successfully with mock.
glibc-devel being in the buildroot is not what is needed to fix this problem. The x86_64 buildroots need glibc-devel.i386 in them in order to build. I'm working with our buildsystem team to make this happen.
Adding a file level BuildRequires worked for this package. Will be released in rawhide tonight. BuildRequires: /usr/include/gnu/stubs-32.h