[mythtv] Compiling on AMD64

[Tony Brummett]

I'm compiling myth for the first time on an AMD64 machine with the
x86_64 version of Fedora Core 4.  ./configure was complaining about
not being able to find libmp3lame until I added /lib64 and /usr/lib64
to /etc/ld.so.conf

I was just windering if this was normal?  I figured that either those
directories would be put in ld.so.conf by the OS installer, or that
configure would know if the arch is x86_64, then you have to look in
the 64-bit lib directories for some libs.

-- Tony