Add intel hardware assisted crc32c support

Not tested, since I don't have the hardware.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/Makefile b/Makefile
index 11bb17e..c95c3dc 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,7 @@
 OBJS += crc/crc16.o
 OBJS += crc/crc32.o
 OBJS += crc/crc32c.o
+OBJS += crc/crc32c-intel.o
 OBJS += crc/crc64.o
 OBJS += crc/sha256.o
 OBJS += crc/sha512.o