Update libsrtp to 1.5.2

srtp/crypto/include/datatypes.h

 /*
  * datatypes.h
  * 
  * data types for bit vectors and finite fields
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  */
 
 /*
@@ skipping 371 matching lines @@
  * and b are not equal, returns 0 otherwise
  */
 
 int
 octet_string_is_eq(uint8_t *a, uint8_t *b, int len);
 
 void
 octet_string_set_to_zero(uint8_t *s, int len);
 
 
-#if !defined(SRTP_KERNEL_LINUX) //&& defined(HAVE_CONFIG_H) 
+#if !defined(SRTP_KERNEL_LINUX) && defined(HAVE_CONFIG_H) 
 
 /* 
  * Convert big endian integers to CPU byte order.
  */
 #ifdef WORDS_BIGENDIAN
 /* Nothing to do. */
 # define be32_to_cpu(x) (x)
 # define be64_to_cpu(x) (x)
 #elif defined(HAVE_BYTESWAP_H)
 /* We have (hopefully) optimized versions in byteswap.h */
@@ skipping 110 matching lines @@
 bitvector_left_shift(bitvector_t *x, int index);
 
 char *
 bitvector_bit_string(bitvector_t *x, char* buf, int len);
 
 #ifdef TESTAPP_SOURCE
 int base64_string_to_octet_string(char *raw, int *pad, char *base64, int len);
 #endif
 
 #endif /* _DATATYPES_H */