Summary:
Glog v0.4.0 when configured with Debug build type adds a 'd' suffix to
the library file. This results in FindGlog.cmake failing to locate it.

Update FindGlog.cmake to use check for 'glogd', and use
select_library_configurations() to set GLOG_LIBRARY to the correct
found filename.

(Note: this has no effect if a non-Debug type is used.)

Pull Request resolved: https://github.com/facebook/folly/pull/1479

Reviewed By: yfeldblum

Differential Revision: D24503510

Pulled By: Orvid

fbshipit-source-id: 705df05a4a3d7df2df8af3bb66c319fb044adbce