Add support for using OpenSSL SRTP KDF algorithm.  This work was originally done by Barry Fussell, but has been adapted to the latest libsrtp.  Added new configure option called --enable-openssl-kdf to enable this feature.  Also added new configure option to specify the location of the OpenSSL directory (--with-openssl-dir).  Lastly, this commit updates config_in.h (via autoheader).
diff --git a/config_in.h b/config_in.h
index 95171f9..9aeea19 100644
--- a/config_in.h
+++ b/config_in.h
@@ -1,5 +1,8 @@
 /* config_in.h.  Generated from configure.in by autoheader.  */
 
+/* Define if building universal (internal helper macro) */
+#undef AC_APPLE_UNIVERSAL_BUILD
+
 /* Define if building for a CISC machine (e.g. Intel). */
 #undef CPU_CISC
 
@@ -42,9 +45,18 @@
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
+/* Define to 1 if you have the `crypto' library (-lcrypto). */
+#undef HAVE_LIBCRYPTO
+
+/* Define to 1 if you have the `dl' library (-ldl). */
+#undef HAVE_LIBDL
+
 /* Define to 1 if you have the `socket' library (-lsocket). */
 #undef HAVE_LIBSOCKET
 
+/* Define to 1 if you have the `z' library (-lz). */
+#undef HAVE_LIBZ
+
 /* Define to 1 if you have the <machine/types.h> header file. */
 #undef HAVE_MACHINE_TYPES_H
 
@@ -54,6 +66,9 @@
 /* Define to 1 if you have the <netinet/in.h> header file. */
 #undef HAVE_NETINET_IN_H
 
+/* Define to 1 if you have the `pcap' library (-lpcap) */
+#undef HAVE_PCAP
+
 /* Define to 1 if you have the `sigaction' function. */
 #undef HAVE_SIGACTION
 
@@ -72,9 +87,6 @@
 /* Define to 1 if you have the <string.h> header file. */
 #undef HAVE_STRING_H
 
-/* Define to 1 if you have the <syslog.h> header file. */
-#undef HAVE_SYSLOG_H
-
 /* Define to 1 if you have the <sys/int_types.h> header file. */
 #undef HAVE_SYS_INT_TYPES_H
 
@@ -117,6 +129,12 @@
 /* Define to use X86 inlined assembly code */
 #undef HAVE_X86
 
+/* Define this to use OpenSSL crypto. */
+#undef OPENSSL
+
+/* Define this to use OpenSSL KDF for SRTP. */
+#undef OPENSSL_KDF
+
 /* Define to the address where bug reports for this package should be sent. */
 #undef PACKAGE_BUGREPORT
 
@@ -129,30 +147,35 @@
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
 
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 
-/* The size of a `unsigned long', as computed by sizeof. */
+/* The size of `unsigned long', as computed by sizeof. */
 #undef SIZEOF_UNSIGNED_LONG
 
-/* The size of a `unsigned long long', as computed by sizeof. */
+/* The size of `unsigned long long', as computed by sizeof. */
 #undef SIZEOF_UNSIGNED_LONG_LONG
 
-/* Define to use OpenSSL crypto. */
-#undef OPENSSL
-
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
 
 /* Write errors to this file */
 #undef USE_ERR_REPORTING_FILE
 
-/* Define to use syslog logging. */
-#undef USE_SYSLOG
-
-/* Define to 1 if your processor stores words with the most significant byte
-   first (like Motorola and SPARC, unlike Intel and VAX). */
-#undef WORDS_BIGENDIAN
+/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
+   significant byte first (like Motorola and SPARC, unlike Intel). */
+#if defined AC_APPLE_UNIVERSAL_BUILD
+# if defined __BIG_ENDIAN__
+#  define WORDS_BIGENDIAN 1
+# endif
+#else
+# ifndef WORDS_BIGENDIAN
+#  undef WORDS_BIGENDIAN
+# endif
+#endif
 
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const
@@ -163,5 +186,5 @@
 #undef inline
 #endif
 
-/* Define to `unsigned' if <sys/types.h> does not define. */
+/* Define to `unsigned int' if <sys/types.h> does not define. */
 #undef size_t