Make USE_PYTHON=concurrent flavors friendly.

Before, it would only create the default symlink if the Python version
was the default Python version.  Change that to if the Python flavor is
the default flavor.

PR:		224242
Sponsored by:	Absolight

Mk/Uses/python.mk

@@ -567,7 +567,9 @@ RUN_DEPENDS+=	cython-${PYTHON_VER}:lang/cython@${PY_FLAVOR}
 
 .if defined(_PYTHON_FEATURE_CONCURRENT)
 _USES_POST+=		uniquefiles:dirs
-.if ${PYTHON_VERSION} == ${PYTHON_DEFAULT_VERSION}
+.if defined(_PYTHON_FEATURE_FLAVORS) && ${FLAVOR} == ${FLAVORS:[1]}
+UNIQUE_DEFAULT_LINKS=	yes
+.elif !defined(_PYTHON_FEATURE_FLAVORS) && ${PYTHON_VERSION} == ${PYTHON_DEFAULT_VERSION}
 UNIQUE_DEFAULT_LINKS=	yes
 .else
 UNIQUE_DEFAULT_LINKS=	no