libtxc_dxtn is no longer necessary, and is no longer available on the
AUR, so remove the reference to reduce confusion.
Remove the .install file because gtk2 now seems to use fallbacks if the
engine is not available. Use bsdtar instead of unzip to avoid the
makedep. Use exec in .sh since the bash process is useless while
The .SRCINFO shows more changes because it is showing the x86_64 deps
now, which is apt since i686 is no longer supported by core Arch. I
could remove support for i686, but leaving it since it may be useful to
someone and isn't hurting anything.