On Mac, the build fails because of a missing const.

The error is: ``` /Users/iota/Projects/CDP8/dev/newsfsys/sfdir.c:97:44: error: incompatible function pointer types passing 'int (struct dirent *)' to parameter of type 'int (*)(const struct dirent *)' [-Wincompatible-function-pointer-types] 97 | if((numfiles = scandir(".", &filelist, selfn, alphasort)) < 0) | ^~~~~ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk/usr/include/dirent.h:150:11: note: passing argument to parameter here 150 | int (*)(const struct dirent *), int (*)(const struct dirent **, const struct dirent **)) __DARWIN_INODE64(scandir); | ^ 1 error generated. ``` It happens only on Mac when macros `WIN32` and `linux` are not defined. I see there is the same code in the file dev/sfsys/sfdir.c but it seems not used, should I update it as well or is it dead code?