v.support fixes of GRASS 4.15

[Bill Brown]

The only program in grass4.1 that used the function with the
error in it in the file level_two.c was "v.build".  "v.support"
calls v.build - that's why you had the problem.  Running gmake4.1
in the directory src/mapdev remakes the Vlib and also remakes
other programs under that directory which are dependent on
$(VECTLIB), which includes v.build.  

Your problem should be fixed.

- Bill