gflags-2.2.1-bp153.1.20

- Add RPM groups. Fix wrong devel-static description.

- Update to version 2.2.1
  * Link to online documentation in README
  * Merged 194: Include utils by file instead of CMAKE_MODULE_PATH
    search
  * Merged 195: Remove unused program_name variable
  * Merged 196: Enable language C for older CMake versions when
    needed
  * Merged 202: Changed include directory in bazel build
  * Merged 207: Mark single argument constructors in mutex.h as
    explicit
  * Merged 215: Fix static initialization order fiasco caused by
    global registry lock
  * Merged 216: Fix use of ARGC in CMake macros
  * Merged 222: Static code analyzer error regarding strncmp with
    empty kRootDir
- Renamed source file

- Initial 2.2.0 release