fix compiler warnings.

code/MD2/MD2Loader.cpp

@@ -344,7 +344,7 @@ void MD2Importer::InternReadFile( const std::string& pFile,
         if (pcSkins->name[0])
         {
             aiString szString;
-            const size_t iLen = ::strlen(pcSkins->name);
+            const ai_uint32 iLen = (ai_uint32) ::strlen(pcSkins->name);
             ::memcpy(szString.data,pcSkins->name,iLen);
             szString.data[iLen] = '\0';
             szString.length = iLen;

code/MD5/MD5Parser.cpp

@@ -235,7 +235,7 @@ bool MD5Parser::ParseSection(Section& out)
     const char* szStart = ++sz; \
 	while('\"'!=*sz)++sz; \
     const char* szEnd = (sz++); \
-    out.length = (size_t)(szEnd - szStart); \
+    out.length = (ai_uint32) (szEnd - szStart); \
     ::memcpy(out.data,szStart,out.length); \
     out.data[out.length] = '\0';
 // ------------------------------------------------------------------------------------------------