RFR: Fix typo when translating characters in $USER.

[Severin Gehwolf]

Hi,

I've noticed that when I do a build of OpenJDK 9 hs-comp forest then the
generated build ID eats the "w" from my local username. Reproducer bash
snippet:

(USER=xwwwx; a=$(echo $USER | tr -d -c 'abcdefghijklmnopqrstuvqxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'); if [ "$a" == "xx" ]; then echo BAD; else echo GOOD; fi)

It should print GOOD, but prints BAD.

As it turns out there is a typo in common/autoconf/jdk-options.m4

webrev is here:
https://jerboaa.fedorapeople.org/bugs/openjdk/JDK-UNKNOWN-build-dev/webrev.00/

Could someone please sponsor this change for me?

Since I work for Red Hat the OCA has been signed.

Thanks,
Severin