Use GLOG_* environment variables even when gflags is installed.
Define GLOG_DEFINE_*, which checks if the GLOG_* environment variable is defined. If defined, GLOG_DEFINE_* passes the value and otherwise, it passes the original default value. In this way, GLOG_DEFINE_* macro uses the value specified by gflags first, then GLOG_* environment variables, and finally it uses the default value if neither of them are specified. git-svn-id: https://google-glog.googlecode.com/svn/trunk@76 eb4d4688-79bd-11dd-afb4-1d65580434c0
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