gnupg: Do not build gnupg as Universal Binary on Snow Leopard.

gcc -E -I.. -I../include -DHAVE_CONFIG_H mpih-mul1.S | grep -v '^#' > _mpih-mul1.s
gcc -DHAVE_CONFIG_H -I. -I.. -I.. -I../include    -arch x86_64 -arch i386 -Os -Wall -Wno-pointer-sign   -c _mpih-mul1.s
_mpih-mul1.s:6:suffix or operands invalid for `push'
_mpih-mul1.s:7:suffix or operands invalid for `push'
_mpih-mul1.s:8:suffix or operands invalid for `push'
_mpih-mul1.s:9:suffix or operands invalid for `push'
_mpih-mul1.s:33:suffix or operands invalid for `pop'
_mpih-mul1.s:34:suffix or operands invalid for `pop'
_mpih-mul1.s:35:suffix or operands invalid for `pop'
_mpih-mul1.s:36:suffix or operands invalid for `pop'
lipo: can't open input file: /var/folders/K8/K8uP4o7jGtCkuxQJs27DPU+++TI/-Tmp-//cc30UzJZ.out (No such file or directory)
make[3]: *** [mpih-mul1.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [all-recursive] Error 1
make[1]: *** [all] Error 2
make: *** [build] Error 2