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graphics/opencolorio: fix build with GCC-based architectures

Description

graphics/opencolorio: fix build with GCC-based architectures

Add -Wno-unused-function -Wno-error to CXXFLAGS when using GCC.

While here, add USES=localbase:ldflags.

PR: 233888
Approved by: FreeBSD@ShaneWare.Biz (maintainer), mat (mentor)
Differential Revision: https://reviews.freebsd.org/D20089

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