config: Drop linux-alpha-gcc+bwx

Its entry in Configuration/10-main.conf was dropped in commit
7ead0c89 ("Configure: fold related configurations more aggressively
and clean-up.") probably because all but one of its bn_ops were removed
(RC4_CHAR remained). Benchmarks on an Alpha EV7 indicate that RC4_INT is
better than RC4_CHAR so rather than restoring the configuation, remove
it from config.

CLA: trivial
Bug: https://bugs.gentoo.org/697840


(cherry picked from commit 19ded1a717b6c72c3db241f06787a353f1190755)
Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11130)

config

@@ -509,10 +509,7 @@ case "$GUESSOS" in
 	OUT="ios64-cross" ;;
   alpha-*-linux2)
         ISA=`awk '/cpu model/{print$4;exit(0);}' /proc/cpuinfo`
-	case ${ISA:-generic} in
-	*[678])	OUT="linux-alpha+bwx-$CC" ;;
-	*)	OUT="linux-alpha-$CC" ;;
-	esac
+	OUT="linux-alpha-$CC"
 	if [ "$CC" = "gcc" ]; then
 	    case ${ISA:-generic} in
 	    EV5|EV45)		__CNF_CFLAGS="$__CNF_CFLAGS -mcpu=ev5"