alpha.c: Include libfuncs.h

alpha.c: Include libfuncs.h

	* config/alpha/alpha.c: Include libfuncs.h
	(avms_asm_output_extern): New function.
	(alpha_init_libfuncs): Init some decc libfuncs.
	* config/alpha/alpha-protos.h (avms_asm_output_external): Declare.
	* config/alpha/vms.h (ASM_OUTPUT_EXTERNAL): Define.
	(DO_CRTL_NAMES): Define.
	(LIB_SPEC): Remove.
	* config/alpha/vms64.h: (POINTERS_EXTEND_UNSIGNED): Remove undef.
	(LONG_TYPE_SIZE): Define.
	(TARGET_OS_CPP_BUILTINS): Define with __LONG_POINTERS=1
	(SUBTARGET_SWITCHES): Define malloc64 switch.
	(TARGET_DEFAULT): Default MASK_MALLOC64 set.
	(MASK_RETURN_ADDR): Define.
	doc/invoke.texi (mmalloc64): Document switch.

From-SVN: r150614