Adjust the configuration target name from Cygwin-i686 to Cygwin-x86

This is to reflect that it's not limited to just i686.

Reviewed-by: Rich Salz <rsalz@openssl.org>

config

diff --git a/config b/config
index 6f8ee91..2b3b6d8 100755
--- a/config
+++ b/config
@@ -806,6 +806,7 @@
 	fi
 	;;
   # these are all covered by the catchall below
+  i[3456]86-*-cygwin) OUT="Cygwin-x86" ;;
   *-*-cygwin) OUT="Cygwin-${MACHINE}" ;;
   x86pc-*-qnx6) OUT="QNX6-i386" ;;
   *-*-qnx6) OUT="QNX6" ;;