databases/libiodbc: update to 3.52.15

• Added support for macOS Big Sur (11.x) on Apple Silicon using a universal build
• Fixed title to show CPU architecture used
• Fixed length of error message buffer
• Removed support for Mac OS X Snow Leopard (10.6) and older
• Removed deprecated iODBCcfmbridge for PPC
• Upgraded iODBC build to use recent versions of Xcode
  • Minimum Xcode version is set to Xcode 8.0
  • Minimum macOS deployment target is OS X Mavericks (10.9)
  • Migrated dialogs and plist files
  • Migrated translation support