Remove unused variables

The variable OBJARCH was used to compile objects for both 32-bit and
64-bit architectures. It can be removed because this is only relevant
for the Ruby wrapper for hiredis. This wrapper should put these flags in
CFLAGS to get the same effect.

Makefile

@@ -35,7 +35,6 @@ ifeq ($(uname_S),SunOS)
   INSTALL= cp -r
 endif
 ifeq ($(uname_S),Darwin)
-  OBJARCH?=-arch i386 -arch x86_64
   DYLIBSUFFIX=dylib
   STLIBSUFFIX=a
   DYLIB_MINOR_NAME=$(LIBNAME).$(HIREDIS_MAJOR).$(HIREDIS_MINOR).$(DYLIBSUFFIX)
@@ -100,7 +99,7 @@ check: hiredis-test
 	kill `cat /tmp/hiredis-test-redis.pid`
 
 .c.o:
-	$(CC) -std=c99 -pedantic -c $(REAL_CFLAGS) $(OBJARCH) $(COMPILE_TIME) $<
+	$(CC) -std=c99 -pedantic -c $(REAL_CFLAGS) $<
 
 clean:
 	rm -rf $(DYLIBNAME) $(STLIBNAME) $(BINS) hiredis-example* *.o *.gcda *.gcno *.gcov