poly1305/asm/poly1305-x86_64.pl: make it cross-compile.

Reviewed-by: NRichard Levitte <levitte@openssl.org>

crypto/poly1305/asm/poly1305-x86_64.pl

@@ -495,10 +495,10 @@ poly1305_blocks_avx:
 
 	################################# base 2^26 -> base 2^64
 	mov	$d1#d,$h0#d
-	and	\$`-1<<31`,$d1
+	and	\$`-1*(1<<31)`,$d1
 	mov	$d2,$r1			# borrow $r1
 	mov	$d2#d,$h1#d
-	and	\$`-1<<31`,$d2
+	and	\$`-1*(1<<31)`,$d2
 
 	shr	\$6,$d1
 	shl	\$52,$r1
@@ -1383,10 +1383,10 @@ poly1305_blocks_avx2:
 
 	################################# base 2^26 -> base 2^64
 	mov	$d1#d,$h0#d
-	and	\$`-1<<31`,$d1
+	and	\$`-1*(1<<31)`,$d1
 	mov	$d2,$r1			# borrow $r1
 	mov	$d2#d,$h1#d
-	and	\$`-1<<31`,$d2
+	and	\$`-1*(1<<31)`,$d2
 
 	shr	\$6,$d1
 	shl	\$52,$r1