re PR fortran/32021 (Fix,document,remove GFORTRAN_* environment variables)

	PR libfortran/32021

	* runtime/environ.c (init_mem, show_mem, init_round, show_round,
	init_precision, show_precision, init_signal, show_signal): Remove.
	(variable_table): Remove GFORTRAN_MEM_INIT, GFORTRAN_MEM_CHECK,
	GFORTRAN_SIGHUP, GFORTRAN_SIGINT, GFORTRAN_FPU_ROUND and
	GFORTRAN_FPU_PRECISION.
	* libgfortran.h (options_t): Remove mem_check, fpu_round,
	fpu_precision, sighup, sigint, allocate_init_flag and
	allocate_init_value.

From-SVN: r129014