Add BR: perl.
    
    See: https://fedoraproject.org/wiki/Packaging:Perl#Build_Dependencies
    
    No rebuild is needed.
    
    The build error was:
    
    PASS: threads_t
    ok 1 - MMDB_lib_version exists
    ok 2 - version is 1.2.0
    1..2
    PASS: version_t
    /usr/bin/env: 'perl': No such file or directory
    FAIL: compile_c++_t.pl
    /usr/bin/env: 'perl': No such file or directory
    FAIL: mmdblookup_t.pl
    ====================================
    2 of 17 tests failed