RFR: 8200586: Update JDK11 release date to 2018-09-25

[Tim Bell]

Abhijit:

> Release date for jdk11 seems incorrectly shown as '2018-09-18' while
> it should be '2018-09-25'. Need to update the configuration accordingly.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8200586
>
> Change:
>
> --- a/make/autoconf/version-numbers
> +++ b/make/autoconf/version-numbers
> @@ -29,7 +29,7 @@
>   DEFAULT_VERSION_INTERIM=0
>   DEFAULT_VERSION_UPDATE=0
>   DEFAULT_VERSION_PATCH=0
> -DEFAULT_VERSION_DATE=2018-09-18
> +DEFAULT_VERSION_DATE=2018-09-25
>   DEFAULT_VERSION_CLASSFILE_MAJOR=55  # "`$EXPR $DEFAULT_VERSION_FEATURE
> + 44`"
>   DEFAULT_VERSION_CLASSFILE_MINOR=0
>   DEFAULT_ACCEPTABLE_BOOT_VERSIONS="9 10 11"

Looks good.

Tim