multimedia/xmms:
- Add zh-xmms to CONFLICTS.
- Convert USE_GNOME=desktopfileutils and USE_GMAKE to USES.
- Make USE_GL conditional on the SPEC option.
- Make gettext conditional on new NLS option.
- Only set USE_AUTOTOOLS for the RUSXMMS_PATCHES option.
- Remove LIBS from CONFIGURE_ENV. Set LDFLAGS instead.
- Add missing xorg dependencies.
- Add xmms_cv_newpcm_driver=yes to CONFIGURE_ARGS. The configure test
fails on recent version of FreeBSD but the code it enables is still
relevant. Without it you cannot select a different output device.
- Remove SUB_FILES. None of the files require substitutions.
- Remove IPV6 from OPTIONS_DEFAULT. It's implicit.
- Don't exclude SIMD option from amd64.
- Use option helpers like OPTIONS_SUB, opt_CONFIGURE_ENABLE, etc.
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