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>

Configurations/10-main.conf

@@ -1221,7 +1221,7 @@
     },
 
 #### Cygwin
-    "Cygwin-i686" => {
+    "Cygwin-x86" => {
         inherit_from     => [ asm("x86_asm") ],
         cc               => "gcc",
         cflags           => "-DTERMIOS -DL_ENDIAN -Wall",

config

@@ -806,6 +806,7 @@ case "$GUESSOS" in
 	fi
 	;;
   # these are all covered by the catchall below
+  i[3456]86-*-cygwin) OUT="Cygwin-x86" ;;
   *-*-cygwin) OUT="Cygwin-${MACHINE}" ;;
   x86pc-*-qnx6) OUT="QNX6-i386" ;;
   *-*-qnx6) OUT="QNX6" ;;