nettle: make Neon detection work, and infer armv6

ARMv6 detection relied on seeing armv6 or armv7 in the toolchain name,
which is not the case. And with ARMv6 not detected, the Neon detection
wasn't attempted.

Always attempt Neon detection for arm, and if found, assume ARMv6 too.
This avoids having to think about changing the ARMv6 detection.

release/src/router/nettle/configure

@@ -6564,9 +6564,7 @@ if test "x$enable_assembler" = xyes ; then
 	OPT_NETTLE_SOURCES="fat-arm.c $OPT_NETTLE_SOURCES"
 	FAT_TEST_LIST="arch:5 arch:6,neon"
       else
-	case "$host_cpu" in
-	  armv6* | armv7*)
-	    if test "$enable_arm_neon" = auto ; then
+	if test "$enable_arm_neon" = auto ; then
   if test "$cross_compiling" = yes ; then
             { $as_echo "$as_me:${as_lineno-$LINENO}: checking if assembler accepts Neon instructions" >&5
 $as_echo_n "checking if assembler accepts Neon instructions... " >&6; }
@@ -6613,12 +6611,14 @@ $as_echo "$enable_arm_neon" >&6; }
   fi
 fi
 
-
-	    asm_path="arm/v6 arm"
-	    ;;
-	esac
 	if test "x$enable_arm_neon" = xyes ; then
-	  asm_path="arm/neon $asm_path"
+	  asm_path="arm/neon arm/v6 $asm_path"
+	else
+	  case "$host_cpu" in
+	    armv678*)
+	      asm_path="arm/v6 arm"
+	      ;;
+	  esac
 	fi
       fi
       ;;

release/src/router/nettle/configure.ac

@@ -447,15 +447,15 @@ if test "x$enable_assembler" = xyes ; then
 	OPT_NETTLE_SOURCES="fat-arm.c $OPT_NETTLE_SOURCES"
 	FAT_TEST_LIST="arch:5 arch:6,neon"
       else
-	case "$host_cpu" in
-	  armv6* | armv7*)
-	    NETTLE_CHECK_ARM_NEON
-
-	    asm_path="arm/v6 arm"
-	    ;;
-	esac
+	NETTLE_CHECK_ARM_NEON
 	if test "x$enable_arm_neon" = xyes ; then
-	  asm_path="arm/neon $asm_path"
+	  asm_path="arm/neon arm/v6 $asm_path"
+	else
+	  case "$host_cpu" in
+	    armv[678]*)
+	      asm_path="arm/v6 arm"
+	      ;;
+	  esac
 	fi
       fi
       ;;