Add pic feature to QNX cc_toolchain_config

[nradakovic]

Introduce a pic feature that passes -fPIC for compile/assemble actions when the pic variable is available, and register it in the toolchain feature list.

resolves #107

[Copilot]

Pull request overview

Adds the missing pic feature to the QNX cc_toolchain_config template so Bazel’s PIC builds (e.g., shared libraries producing .pic.o) actually compile/assemble with -fPIC when the pic build variable is present. This aligns the QNX template with the existing Linux template behavior and addresses issue #107.

Changes:

• Introduce a pic feature that injects -fPIC for compile and assemble-related actions gated by expand_if_available = "pic".
• Register the new pic feature in the toolchain’s feature list alongside supports_pic.

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[AlexanderLanin]

AI-assisted review (Claude):

Severity: Critical: 0, Important: 0, Suggestions: 0

The change is a faithful port of the Linux template's pic_feature (identical flag_set structure and expand_if_available = "pic" gating), registered directly after supports_pic_feature — matching the Linux ordering. qcc accepts -fPIC as passed through to the underlying GCC frontend, so no QNX-specific adjustment is needed.

Coverage looks fine: tests/feature_verification:pic_test already builds pic_test_lib with linkstatic = False, so it exercises .pic.o compilation and would fail before this fix. No new test needed.

LGTM.