remove unused kernel/main

kernel/main.asm

@@ -1,36 +0,0 @@
-		cpu 8086
-		org 0x7C00
-
-		jmp init
-
-%include	"kernel/fd.asm"
-%include	"kernel/con.asm"
-
-entry_int21:	iret
-
-init:		; install int 21h handler
-		mov ax, cs
-		mov ds, ax
-		mov es, ax
-		mov word [4*0x21], entry_int21
-		mov word [4*0x21+2], cs
-
-		mov word [fd_table], con_ftab
-
-		; print banner
-		mov dx, .banner
-		mov cx, 13
-		mov bx, 0
-		call con_write
-
-		; execute shell
-		mov ax, 0x4B00
-		mov dx, .shellfn
-		int 0x21
-
-.hlt:		hlt
-		jmp .hlt
-
-.banner:	db "rdos kernel", 0x0A, 0x0D
-
-.shellfn:	db "SHELL.COM", 0