Changes to make libbitdht compile on OSX.

- changed <malloc.h> => <stdlib.h>
	- put #ifdef __cplusplus protection in bdstring.h so it can be used by C modules.



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@5231 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libbitdht/src/util/bdstring.cc

@@ -25,7 +25,7 @@
 #include <windows.h>
 #else
 #include <stdarg.h>
-#include <malloc.h>
+#include <stdlib.h>
 #endif
 #include <stdio.h>
 

libbitdht/src/util/bdstring.h

@@ -22,8 +22,6 @@
  *  Boston, MA  02110-1301, USA.
  ****************************************************************/
 
-#include <string>
-
 #ifdef WIN32
 // for proper handling of %ll
 #define bd_snprintf __mingw_snprintf
@@ -33,7 +31,12 @@
 #define bd_fprintf  fprintf
 #endif
 
-int bd_sprintf(std::string &str, const char *fmt, ...);
-int bd_sprintf_append(std::string &str, const char *fmt, ...);
+#ifdef __cplusplus
+	// These definitions are only available for C++ Modules.
+	#include <string>
+
+	int bd_sprintf(std::string &str, const char *fmt, ...);
+	int bd_sprintf_append(std::string &str, const char *fmt, ...);
+#endif
 
 #endif