Add sha1 - AVX2 supported fast implementation, with some crc32c cleanup

pkgs/cpu/cpu.h

@@ -0,0 +1,24 @@
+/*
+ * Mini Object Storage, (C) 2014 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __CPU_H__
+#define __CPU_H__
+
+int has_sse41 (void);
+int has_avx (void);
+int has_avx2 (void);
+
+#endif /* __CPU_H__ */