Fix file header copy&paste errors.

chacha-poly1305.c

-/* chacha-poly1305.h
+/* chacha-poly1305.c
 
    AEAD mechanism based on chacha and poly1305.
 

des-compat.c

-/* des-compat.h
+/* des-compat.c
 
    The des block cipher, old libdes/openssl-style interface.
 

des3.c

-/* des3.h
+/* des3.c
 
    Triple DES cipher. Three key encrypt-decrypt-encrypt.
 

ecc-224.c

-/* ecc-224.c.c
+/* ecc-224.c
 
    Compile time constant (but machine dependent) tables.
 

ecc-256.c

-/* ecc-256.c.c
+/* ecc-256.c
 
    Compile time constant (but machine dependent) tables.
 

ecc-384.c

-/* ecc-384.c.c
+/* ecc-384.c
 
    Compile time constant (but machine dependent) tables.
 

gcm.c

-/* gcm.h
+/* gcm.c
 
    Galois counter mode, specified by NIST,
    http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf

md4.c

-/* md4.h
+/* md4.c
 
    The MD4 hash function, described in RFC 1320.