sha/asm/sha{256|512}-armv4.pl: harmonize thumb2 support with the rest.

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

crypto/sha/asm/sha256-armv4.pl

@@ -254,7 +254,7 @@ for($i=0;$i<16;$i++)	{ &BODY_00_15($i,@V); unshift(@V,pop(@V)); }
 $code.=".Lrounds_16_xx:\n";
 for (;$i<32;$i++)	{ &BODY_16_XX($i,@V); unshift(@V,pop(@V)); }
 $code.=<<___;
-#if __ARM_ARCH__>=7
+#ifdef	__thumb2__
 	ite	eq			@ Thumb2 thing, sanity check in ARM
 #endif
 	ldreq	$t3,[sp,#16*4]		@ pull ctx

crypto/sha/asm/sha512-armv4.pl

@@ -157,7 +157,7 @@ $code.=<<___;
 	teq	$t0,#$magic
 
 	ldr	$t3,[sp,#$Coff+0]	@ c.lo
-#if __ARM_ARCH__>=7
+#ifdef	__thumb2__
 	it	eq			@ Thumb2 thing, sanity check in ARM
 #endif
 	orreq	$Ktbl,$Ktbl,#1
@@ -411,7 +411,7 @@ $code.=<<___;
 ___
 	&BODY_00_15(0x17);
 $code.=<<___;
-#if __ARM_ARCH__>=7
+#ifdef	__thumb2__
 	ittt	eq			@ Thumb2 thing, sanity check in ARM
 #endif
 	ldreq	$t0,[sp,#`$Xoff+8*(16-1)`+0]