Add perl-5.26.1-4

Rebuild for new glibc to avoid errors during xs compilation [1]

    cc -c  -I"/home/buczek/x86" -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2 -O2   -DVERSION=\"0.00\" -DXS_VERSION=\"0.00\" -fPIC "-I/pkg/perl-5.26.1-3/lib/5.26.1/x86_64-linux/CORE"   cpuid_pl_e48a.c
    In file included from cpuid_pl_e48a.xs:2:0:
    /pkg/perl-5.26.1-3/lib/5.26.1/x86_64-linux/CORE/perl.h:738:13: fatal error: xlocale.h: No such file or directory
     #   include <xlocale.h>
                 ^~~~~~~~~~~
    compilation terminated.
    Makefile:330: recipe for target 'cpuid_pl_e48a.o' failed

created with

    cp perl-5.26.1-3.build.sh perl-5.26.1-4.build.sh

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1464244