[Patch, option handling] optc-gen.awk - support || in EnabledBy()

[Tobias Burnus]

In fortran/*.opt, I'd like to use:

Fortran Var(warn_tabs) Warning EnabledBy(Wall || Wpedantic)

However, "||" is not supported by EnabledBy. This patch adds it. I 
checked that option.c remains the same after the patch.

I attached the patch twice: Once with "-w -U16" to show the modification 
(minus re-indenting) and once with re-indenting.

OK for the trunk?

Tobias

gcc/
2014-11-22  Tobias Burnus <net-b.de>

     * optc-gen.awk: Support || in EnabledBy.
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