squid security update

[7:4.15-3.0.3.1]

• Add libtool-ltdl to squid Requires: [Orabug: 34992040]
  [ - 7:4.15-3.0.1.1]
• Obsolete squid-sysvinit [Jira: OLDIS-20090]
  [7:4.15-3.1]
• Resolves: #2100782 - CVE-2021-46784 squid:4/squid: DoS when processing gopher
  server responses
  [7:4.15-3]
• Resolves: #1941506 - CVE-2021-28116 squid:4/squid: out-of-bounds read in WCCP
  protocol data may lead to information disclosure
  [7:4.15-2]
• Resolves: #2006121 - SQUID shortens FTP Link wrong that contains a semi-colon
  and as a result is not able to download zip file.CODE 404 TO CLIENT)
  [7:4.15-1]
• new version 4.15
• Resolves: #1964384 - squid:4 rebase to 4.15
  [7:4.11-5]
• Resolves: #1944261 - CVE-2020-25097 squid:4/squid: improper input validation
  may allow a trusted client to perform HTTP Request Smuggling
  [7:4.11-4]
• Resolves: #1890606 - Fix for CVE 2019-13345 breaks authentication in
  cachemgr.cgi