2011-04-03 Ivan Maidanski <ivmai@mail.ru>

2011-04-03  Ivan Maidanski  <ivmai@mail.ru>

	* misc.c (GC_stdout, GC_stderr): Move the definition to the place
	where GC_log is defined (Unix only).
	* misc.c (GC_init): Recognize "GC_ONLY_LOG_TO_FILE" environment
	variable and the similar macro; redirect GC_stdout and GC_stderr
	to GC_log if "GC_LOG_FILE" environment variable is set unless
	prohibited by GC_ONLY_LOG_TO_FILE (Unix only).
	* doc/README.environment (GC_ONLY_LOG_TO_FILE): Document.
	* doc/README.macros (GC_ONLY_LOG_TO_FILE): Ditto.