do not add -m64 flags automatically

This fix is already in upstream:
http://trousers.git.sourceforge.net/git/gitweb.cgi?p=trousers/trousers;a=commit;h=30162cb8e2cb621053381b3c334c39d416206939

BUG=chromium-os:36866
TEST=`emerge-stumpy trousers` still works
TEST=`emerge-x32-generic trousers` now works

Change-Id: Ieb45005377bd2646e8a6099c9f530bab41816ee6
Reviewed-on: https://gerrit.chromium.org/gerrit/40156
Reviewed-by: Darren Krahn <dkrahn@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/configure.in b/configure.in
index dfc5824..9476974 100644
--- a/configure.in
+++ b/configure.in
@@ -34,15 +34,6 @@
 	fi
 fi
 
-# Arch specific stuff
-case $target in
-        *ppc64* | *powerpc64* | *x86_64*)
-		CFLAGS="$CFLAGS -m64"
-		;;
-        *)
-                ;;
-esac
-
 # Non-standard OpenSSL location
 AC_MSG_CHECKING([Non-standard OpenSSL location])
 AC_ARG_WITH(openssl,