[tlbuild] 2010 builds

[Akira Kakuto]

Hi Norbert,

> configure: using -nodefaultlibs -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic -lm -lgcc_eh -lgcc -lc -lgcc_eh -lgcc
> configure: error: Bad `--with-tex-banner=TeX Live 2009/dev' version string (must contain ` 2010dev')

Previously it was (must contain ` 2009').
2009 was the version number of Web2C.
Now the temporary version number is 2010dev.
So tex-banner must contain ` 2010dev'.

Thanks,
AKira