Update eppic to latest upstream snapshot
    
    upstream: fedora
    related:  bz2003832
    conflict: yes, non-functional modifications made.
    
    commit 91f1d5989b741eea0ec58525e2d784430282ab7a
    Author: Kairui Song <kasong@redhat.com>
    Date:   Thu Apr 1 16:53:35 2021 +0800
    
        Update eppic to latest upstream snapshot
    
        Also fixes a package build failure:
        ar ccurl libeppic.a eppic_util.o eppic_node.o eppic_var.o eppic_func.o eppic_str.o eppic_op.o eppic_num.o eppic_stat.o eppic_builtin.o eppic_type.o eppic_case.o eppic_api.o eppic_member.o eppic_alloc.o eppic_define.o eppic_input.o eppic_print.o eppicpp.tab.o eppic.tab.o lex.eppic.o lex.eppicpp.o baseops.o
        ar: eppic_util.o: file format not recognized
    
        See eppic commit 0037321e64952b4feb3bd37761fb1067266e9e72 for more
        details.
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>