x86: fix up the new IRQ code for older versions of gas

Older versions of gas don't implement the C-style != operator, they
instead want the Pascal-style <> operator.  Change != to <> so we
don't break compilation with those old versions of gas.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

arch/x86/kernel/entry_64.S

@@ -644,12 +644,12 @@ vector=FIRST_EXTERNAL_VECTOR
 	.balign 32
   .rept	7
     .if vector < NR_VECTORS
-      .if vector != FIRST_EXTERNAL_VECTOR
+      .if vector <> FIRST_EXTERNAL_VECTOR
 	CFI_ADJUST_CFA_OFFSET -8
       .endif
 1:	pushq $(~vector+0x80)	/* Note: always in signed byte range */
 	CFI_ADJUST_CFA_OFFSET 8
-      .if ((vector-FIRST_EXTERNAL_VECTOR)%7) != 6
+      .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6
 	jmp 2f
       .endif
       .previous