Macros in miscfs/union

• FIXUP miscfs/union/union_vnops.c:56
• LOWERVP miscfs/union/union.h:123
• MOUNTTOUNIONMOUNT miscfs/union/union.h:120
• OTHERVP miscfs/union/union.h:125
• UNION_HASH miscfs/union/union_subr.c:63
• UNIONTOV miscfs/union/union.h:122
• UPPERVP miscfs/union/union.h:124
• VTOUNION miscfs/union/union.h:121