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Description of problem:
 icu-4.2.1-5.fc12 cannot be rebuilt on s390x for RHEL6:



ar: creating uconvmsg/libuconvmsg.a
genccode: --match-arch cpu=3 bits=32 big-endian=2
g++ -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -march=z9-109 -mtune=z10 -W -Wall -ansi -pedantic -Wpointer-arith -Wwrite-strings -Wno-long-long   -o ../../bin/uconv uconv.o uwmsg.o -L../../lib -licui18n -L../../lib -licuuc -L../../lib -L../../stubdata -licudata -lpthread -lm   uconvmsg/libuconvmsg.a
/usr/bin/ld: unknown architecture of input file `uconvmsg/libuconvmsg.a(uconvmsg_dat.o)' is incompatible with s390:64-bit output
collect2: ld returned 1 exit status


Actual results:

https://brewweb.devel.redhat.com/taskinfo?taskID=1940248

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Hmm, on the bright side I've definitely built an older icu (as part of the vanilla openoffice.org *internal* icu) so while I haven't a clue about this it should be possible to get this to work.

part of this is https://bugs.icu-project.org/trac/ticket/6969
but most of this is from "checking for genccode assembly... " which is blank and leads the build into a blind alley where the default is 32bit output. 
I've added a simple fix as https://bugs.icu-project.org/trac/ticket/7119

Built as

icu-4.2.1-6.fc12

for the record the objects its trying to link are 32 bit x86  not just 32 bit of the native arch.  32 bit sparc was failing also.