#11 rbc fails to compile against 8.6b2

[John Roll]

Patch:

[john@hopper src]$ diff rbc/generic/ rbc-86/generic/rbcVecMath.c
1650c1650
< Tcl_SetErrorCode(interp, "ARITH", "DOMAIN", interp->result,
---
> Tcl_SetErrorCode(interp, "ARITH", "DOMAIN", Tcl_GetStringResult(interp),
1657c1657
< Tcl_SetErrorCode(interp, "ARITH", "UNDERFLOW", interp->result,
---
> Tcl_SetErrorCode(interp, "ARITH", "UNDERFLOW", Tcl_GetStringResult(interp),
1663c1663
< Tcl_SetErrorCode(interp, "ARITH", "OVERFLOW", interp->result,
---
> Tcl_SetErrorCode(interp, "ARITH", "OVERFLOW", Tcl_GetStringResult(interp),
1672c1672
< Tcl_SetErrorCode(interp, "ARITH", "UNKNOWN", interp->result,
---
> Tcl_SetErrorCode(interp, "ARITH", "UNKNOWN", Tcl_GetStringResult(interp),