drop android's log library.

linux support

libbridge/src/main/cpp/helpers.cpp

@@ -8,6 +8,7 @@
 #include "helpers.hpp"
 #include <set>
 #include <sstream>
+#include <cstring>
 
 const char* vectorToString(const std::vector<std::string>& vec, const std::string separator) {
     // Concatenate all strings in the vector

libbridge/src/main/cpp/wallet2_api_c.cpp

@@ -3,6 +3,7 @@
 #include "wallet2_api.h"
 #include <unistd.h>
 #include "helpers.hpp"
+#include <cstring>
 
 #ifdef __cplusplus
 extern "C"