i386.h tiny cleanup

[Zack Weinberg]

You don't get the preprocessor to auto-define symbols by shoving
#defines into the tm file, and none of our code expects this macro to
be defined.  There are a couple of subtargets that need it, and they
correctly add it to CPP_PREDEFINES.

Committed as obvious fix.

zw

	* i386.h: Remove useless definition of "I386" and misleading
	comment above it.

===================================================================
Index: config/i386/i386.h
--- config/i386/i386.h	2000/02/23 08:43:44	1.101
+++ config/i386/i386.h	2000/02/24 04:58:00
@@ -33,10 +33,6 @@ Boston, MA 02111-1307, USA. */
    ADDR_BEG, ADDR_END, PRINT_IREG, PRINT_SCALE, PRINT_B_I_S, and many
    that start with ASM_ or end in ASM_OP.  */
 
-/* Names to predefine in the preprocessor for this target machine.  */
-
-#define I386 1
-
 /* Stubs for half-pic support if not OSF/1 reference platform.  */
 
 #ifndef HALF_PIC_P