tagwriter option -p not working properly (taglib#1236)

The -p option of tagwriter sample does not work.
This is because the picture file is open in text mode instead of binary.
Also, the isFile function does not work on Windows in 32 bit mode with
large files. Using _stat64 instead of stat solves the problem.

examples/tagwriter.cpp

@@ -48,10 +48,11 @@ bool isArgument(const char *s)
 
 bool isFile(const char *s)
 {
- struct stat st;
 #ifdef _WIN32
- return ::stat(s, &st) == 0 && (st.st_mode & (S_IFREG));
+ struct _stat64 st;
+ return ::_stat64(s, &st) == 0 && (st.st_mode & S_IFREG);
 #else
+ struct stat st;
  return ::stat(s, &st) == 0 && (st.st_mode & (S_IFREG | S_IFLNK));
 #endif
 }
@@ -180,7 +181,7 @@ int main(int argc, char *argv[])
  return 1;
  }
  ifstream picture;
- picture.open(value.toCString());
+ picture.open(value.toCString(), ios::in | ios::binary);
  stringstream buffer;
  buffer << picture.rdbuf();
  picture.close();