Consistently use arm_arch.h constants in armcap assembly code.

Most of the assembly uses constants from arm_arch.h, but a few references to
ARMV7_NEON don't. Consistently use the macros everywhere.
Signed-off-by: NAndy Polyakov <appro@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>

crypto/bn/asm/armv4-mont.pl

@@ -121,7 +121,7 @@ bn_mul_mont:
 #ifdef	__APPLE__
 	ldr	r0,[r0]
 #endif
-	tst	r0,#1			@ NEON available?
+	tst	r0,#ARMV7_NEON		@ NEON available?
 	ldmia	sp, {r0,r2}
 	beq	.Lialu
 	add	sp,sp,#8

crypto/chacha/asm/chacha-armv4.pl

@@ -214,7 +214,7 @@ ChaCha20_ctr32:
 # ifdef	__APPLE__
 	ldr	r4,[r4]
 # endif
-	tst	r4,#1
+	tst	r4,#ARMV7_NEON
 	bne	.LChaCha20_neon
 .Lshort:
 #endif

crypto/poly1305/asm/poly1305-armv4.pl

@@ -108,7 +108,7 @@ poly1305_init:
 	and	r5,r5,r3
 
 #if	__ARM_MAX_ARCH__>=7
-	tst	r12,#1			@ check for NEON
+	tst	r12,#ARMV7_NEON		@ check for NEON
 # ifdef	__APPLE__
 	adr	r9,poly1305_blocks_neon
 	adr	r11,poly1305_blocks

crypto/sha/asm/sha512-armv4.pl

@@ -287,7 +287,7 @@ sha512_block_data_order:
 #ifdef	__APPLE__
 	ldr	r12,[r12]
 #endif
-	tst	r12,#1
+	tst	r12,#ARMV7_NEON
 	bne	.LNEON
 #endif
 	add	$len,$inp,$len,lsl#7	@ len to point at the end of inp