[fortran, patch] Remove unused elements in array argument to set_options

[FX]

For ABI compatibility, we kept some unused elements in the array argument to 
_gfortran_set_options (options that we have removed). With the current ABI 
breakage, we might as well remove those.

Bootstrapped and regtested on x86_64-apple-darwin16.3.0
OK to commit?

FX

set_options.ChangeLog
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set_options.diff
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