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devel/dmlc-core: fix build on GCC architectures

Description

devel/dmlc-core: fix build on GCC architectures

Use USES=compiler:openmp instead of hard dependency on ports LLVM. Use new GCC when using base GCC.

Remove -D_POSIX_SOURCE -D_POSIX_C_SOURCE=200809L, this causes some errno.h macros not being visible.

PR: 242234
Approved by: yuri (maintainer), linimon (mentor)
Differential Revision: https://reviews.freebsd.org/D22580

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