Tighten flag_pic processing in vxworks_override_options

[Olivier Hainque]

This fixes spurious complaints about PIC mode not supported
on "gcc --help=...", on VxWorks without -mrtp. The spurious message
is emitted by vxworks_override_options, called with flag_pic == -1
when we're running for --help.

The change simply adjusts the check testing for "we're generating pic code"
to "flag_pic > 0" instead of just "flag_pic". We're not generating code at
all when reaching here with -1.

Tested by verifying that the spurious message goes away in
production gcc-9 based toolchains for more than a year now, and
sanity checked that I can build a mainline compiler with the
patch applied.

Committing to mainline shortly.

Olivier

2020-09-24  Olivier Hainque  <hainque@adacore.com>

        * config/vxworks.c (vxworks_override_options): Guard pic checks with
        flag_pic > 0 instead of just flag_pic.


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