t-linux (LIBGCC1, [...]): Add macros and set to empty.

e
	* config/t-linux (LIBGCC1, CROSS_LIBGCC1, LIBGCC1_TEST): Add macros and
	set to empty.
	* config/t-linux-aout (LIBGCC1, CROSS_LIBGCC1, LIBGCC1_TEST): Likewise.
	* config/alpha/t-linux: Remove file.
	* config/sparc/t-linux: Remove file.
	* config/m68k/t-linux (LIBGCC1, CROSS_LIBGCC1): Remove.
	* config/m68k/t-linux-aout (LIBGCC1, CROSS_LIBGCC1): Likewise.
	* configure.in (alpha*-*-linux-gnulibc1*): Use t-linux instead of alpha/t-linux
	for tmake_file.
	(alpha*-*-linux-gnu*): Likewise.
	(sparc-*-linux-gnulibc1*): Use t-linux instead of sparc/t-linux for tmake_file.
	(sparc-*-linux-gnu*): Likewise.

From-SVN: r18206