dash: Do not build dash universal on Snow Leopard.
Making all in src
gcc -DHAVE_CONFIG_H -I. -I..  -include ../config.h -DBSD=1 -DSHELL -DIFS_BROKEN  -Wall -arch x86_64 -arch i386 -Os -E -x c -o builtins.def builtins.def.in
gcc -I. -I.. -include ../config.h -DBSD=1 -DSHELL -DIFS_BROKEN  -g -O2 -Wall    -o mknodes mknodes.c
gcc-4.2: -E, -S, -save-temps and -M options are not allowed with multiple -arch flags