[arch-releng] [releng-scripts]: add dosfstools to releng-chroot-manager

[Gerardo Exequiel Pozzi]

-       extrapkgs="vim mc base-devel git svn cvs mkinitcpio libisoburn 
squashfs-tools devtools libui-sh"
+       extrapkgs="vim mc base-devel git svn cvs mkinitcpio libisoburn 
squashfs-tools dosfstools devtools libui-sh"

otherwise x86_64 isos does not build.
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Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1