console-tools size optimization

[Tito]

Hi,
this is a series of patches to reduce the size of some console-tools applets:

1) chvt: remove duplicate code:
   text    data     bss     dec     hex filename
    130       0       0     130      82 console-tools/chvt.o.orig
    101       0       0     101      65 console-tools/chvt.o
2) deallocvt: fix a typo and save 1 byte (can't say why):
   text    data     bss     dec     hex filename
    132       0       0     132      84 console-tools/deallocvt.o.orig
    131       0       0     131      83 console-tools/deallocvt.o
3)openvt: use dup2():
   text    data     bss     dec     hex filename
    194       0       0     194      c2 console-tools/openvt.o.orig
    184       0       0     184      b8 console-tools/openvt.o
4) setconsole: remove var, use libbb.h defines, use bb_xopen():
   text    data     bss     dec     hex filename
    222       0       0     222      de console-tools/setconsole.o.orig
    192       0       0     192      c0 console-tools/setconsole.o

This are trivial changes and should work, so please apply.

Ciao,
Tito
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