Making -m<arch> conditional on x86 (etc.)

Hi,

as discussed on IRC, here is an attempt at fixing the build on ARM.
Tested (briefly) with CCL.

https://gitorious.org/~lichteblau/iolib/lichteblau-iolib/commit/34a537b1

Thanks
d.

------------------------------------------------------------
From 34a537b10142a0d98e474301add11790536ee9aa Mon Sep 17 00:00:00 2001
From: David Lichteblau <david <at> lichteblau.com>
Date: Fri, 27 Apr 2012 12:34:45 +0000
Subject: [PATCH] Conditionalize -m<arch> flag on ISA features

---
 src/grovel/grovel.lisp |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/grovel/grovel.lisp b/src/grovel/grovel.lisp
index a1cac9e..1921b09 100644
--- a/src/grovel/grovel.lisp
+++ b/src/grovel/grovel.lisp
 <at>  <at>  -255,6 +255,9  <at>  <at>  int main(int argc, char**argv) {
 ;;; FIXME: is there a better way to detect whether these flags
 ;;; are necessary?
 (defparameter *cpu-word-size-flags*
+  #-(or x86 x86-64 sparc sparc64)
+  '()