Fix cow Makefile to install to /usr/local

This makes it safe to build on multiple machines
of different architectures.

cow/.gitignore

@@ -1,2 +1,4 @@
 *.o
-/cow
+/i686
+/x86_64
+/alpha

cow/Makefile

@@ -1,10 +1,17 @@
-MAIN = cow
+ARCH=$(shell uname -m)
+MAIN = $(ARCH)/cow
 CFLAGS = -I/usr/include/libxml2 -DDEBUG -pedantic -ansi -Wall
 LDFLAGS = $(CFLAGS) -lxml2 -lxslt
 SOURCES = $(wildcard *.c)
-OBJECTS = $(SOURCES:.c=.o)
+OBJECTS = $(addprefix $(ARCH)/,$(SOURCES:.c=.o))
 
 all: $(MAIN)
 
+$(ARCH):
+	mkdir -p $(ARCH)
+
 $(MAIN): $(OBJECTS)
 	$(CC) $(LDFLAGS) -o $@ $(OBJECTS)
+
+$(ARCH)/%.o: %.c $(ARCH)
+	$(CC) -c $(CFLAGS) -o $@ $<

cow/cow

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec "$(dirname $0)/$(uname -m)/$(basename $0)" "$@"