plotutils fails default universal build

[snc@…]

Duplicates of -arch abound … Since libplot is of the wrong architecture, symbols are undefined for i386.

This was on an x86_64 machine.

/bin/sh ../libtool --mode=link ccache /usr/bin/gcc-4.2  -pipe -O2 -arch x86_64 -arch i386 -L/opt/local/lib -arch x86_64 -arch i386 -o plot  plot.o fontlist.o ../lib/libcommon.a ../libplot/libplot.la -lmx
ccache /usr/bin/gcc-4.2 -pipe -O2 -arch x86_64 -arch i386 -arch x86_64 -arch i386 -o .libs/plot plot.o fontlist.o  -L/opt/local/lib ../lib/libcommon.a ../libplot/.libs/libplot.dylib /opt/local/lib/libpng12.dylib -lz -lmx
ld: warning: in ../libplot/.libs/libplot.dylib, file is not of required architecture
Undefined symbols for architecture i386:

[snc@…]

Fixed in updated from r59346.