Try to appease android's crappy toolchain

llarp/util/file.cpp

@@ -19,24 +19,23 @@
 
 namespace llarp::util
 {
-  static std::pair<fs::ifstream, std::streampos>
-  slurp_file_open(const fs::path& filename)
+  static std::streampos
+  slurp_file_open(const fs::path& filename, fs::ifstream& in)
   {
-    std::pair<fs::ifstream, std::streampos> f;
-    auto& [in, size] = f;
     in.exceptions(std::ifstream::failbit | std::ifstream::badbit);
     in.open(filename, std::ios::binary | std::ios::in);
     in.seekg(0, std::ios::end);
-    size = in.tellg();
+    auto size = in.tellg();
     in.seekg(0, std::ios::beg);
-    return f;
+    return size;
   }
 
   std::string
   slurp_file(const fs::path& filename)
   {
+    fs::ifstream in;
     std::string contents;
-    auto [in, size] = slurp_file_open(filename);
+    auto size = slurp_file_open(filename, in);
     contents.resize(size);
     in.read(contents.data(), size);
     return contents;
@@ -45,7 +44,8 @@ namespace llarp::util
   size_t
   slurp_file(const fs::path& filename, char* buffer, size_t buffer_size)
   {
-    auto [in, size] = slurp_file_open(filename);
+    fs::ifstream in;
+    auto size = slurp_file_open(filename, in);
     if (static_cast<size_t>(size) > buffer_size)
       throw std::length_error{"file is too large for buffer"};
     in.read(buffer, size);