bcal-2.4-bp156.2.5

- Update to version 2.4
  * Support "exit" and "quit" at prompt
  * Fix lint report
- Update to version 2.3
  * Show binary conversion output in octets for readability
  * Handle CTRL+D
  * Quit program or 'exit' or 'quit'
  * Fix broken terminal with calc as backend on "undefined input"

- Update to version 2.2
  * Support [`calc`](http://www.isthe.com/chongo/tech/comp/calc/)
    for multi-base expressions
  * To use `calc`, `export BCAL_USE_CALC=1`
  * Fix lint issues
  * Fix issue #30
  * Updated auto-generated packages
  * More portable Makefile
  * Delete bcal-2.1_gcc9.patch, it was merged into upsteam.

- Added bcal-2.1_gcc9.patch to fix Factory build
- Limit build to 64-bit systems (as per README.md)
- Spec cleanup

- Trim excess whitespace in description. Change to written style.

- Update to version 2.1
  * Support for C bitwise operators (|, ^, &)
  * Support floating point in unit conversion
  * Support hex in expressions
  * Persistent readline history
  * Static-analysis (clang-tidy and coverity) integration
- Update to version 2.0
  * bc mode for general purpose calculations
  * Bitwise shift (<< and >>) operations
  * Base conversion in interactive mode
  * Prompt help

- First realease v1.9