update license of compat and crypto

- change license to be just MIT for all files in compat and crypto
- also add missing header end comments
- ensure default header include style

src/crypto/common.h

@@ -1,5 +1,5 @@
 // Copyright (c) 2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_CRYPTO_COMMON_H
@@ -8,7 +8,9 @@
 #if defined(HAVE_CONFIG_H)
 #include "bitcoin-config.h"
 #endif
+
 #include <stdint.h>
+
 #if defined(HAVE_ENDIAN_H)
 #include <endian.h>
 #endif
@@ -115,4 +117,4 @@ void static inline WriteBE64(unsigned char* ptr, uint64_t x)
 #endif
 }
 
-#endif
+#endif // BITCOIN_CRYPTO_COMMON_H