Fix compile on early Apple platforms.

I think this may be related to the VectorSource check-in. The error is:

algparam.h: In constructor 'ConstByteArrayParameter::ConstByteArrayParameter(const T&, bool) [with T = std::vector<byte, std::allocator<byte> >]':
filters.h:1444:   instantiated from here
algparam.h:56: error: 'const class std::vector<byte, std::allocator<byte> >' has no member named 'data'

1 files changed, 1 insertions, 1 deletions

diff --git a/algparam.h b/algparam.h
index 40c5f46e..1b125f02 100644
--- a/algparam.h
+++ b/algparam.h
@@ -53,7 +53,7 @@ public:
 		: m_deepCopy(false), m_data(NULLPTR), m_size(0)

 	{

 		CRYPTOPP_COMPILE_ASSERT(sizeof(typename T::value_type) == 1);

-		Assign(reinterpret_cast<const byte *>(string.data()), string.size(), deepCopy);

+		Assign(reinterpret_cast<const byte *>(&string[0]), string.size(), deepCopy);

 	}

 

 	/// \brief Assign contents from a memory buffer