UTIL: Fix compilation with curl 7.62.0
    
    The macro CURLE_SSL_CACERT is deprecated in upstream curl
    since commit 3f3b26d6feb0667714902e836af608094235fca2.
    
      commit 3f3b26d6feb0667714902e836af608094235fca2
      Author: Han Han <hhan@thousandeyes.com>
      Date:   Wed Aug 22 11:13:32 2018 -0700
    
          ssl: deprecate CURLE_SSL_CACERT in favour of a unified error code
    
          Long live CURLE_PEER_FAILED_VERIFICATION
    
      sh$ git tag --contains 3f3b26d6feb0667714902e836af608094235fca2
      curl-7_62_0
    
    It was not removed. It is just an alias to
    CURLE_PEER_FAILED_VERIFICATION which causes compile time failures in
    switch/case.
    
    ./src/util/tev_curl.c: In function 'curl_code2errno':
    ./src/util/tev_curl.c:113:5: error: duplicate case value
         case CURLE_PEER_FAILED_VERIFICATION:
         ^~~~
    ./src/util/tev_curl.c: 100:5: note: previously used here
         case CURLE_SSL_CACERT:
         ^~~~
    
    Merges: https://pagure.io/SSSD/sssd/pull-request/3878
    
    Resolves:
    https://pagure.io/SSSD/sssd/issue/3875
    
    Reviewed-by: Sumit Bose <sbose@redhat.com>