Missing $INODE64 versions for readdir_r and fdopendir?

[dkegel-fastly]

Over in tinygo, tinygo-org/tinygo#2644 shows two interesting errors:

ld.lld: error: undefined symbol: _readdir_r$INODE64
tinygo:ld.lld: error: undefined symbol: _fdopendir$INODE64

Those errors go away if you revert tinygo-org/tinygo#2586

Those function calls have been in use since tinygo-org/tinygo#2499 landed.

[aykevl]

Shorter reproducer: GOOS=darwin tinygo test -c compress/flate

[aykevl]

Fixed with ebb736f. It was basically just a matter of adding the dirent.h header file.

[aykevl]

In case such issues occur in the future, these are the steps I took:

• I looked up the header file for the missing symbols. For both readdir_r and fdopendir it is <dirent.h>.
• I added this header to src/libSystem.h.
• I ran ./update.sh to update all generated files.
• I found that sys/dirent.h was missing. I found it in the XNU source code, so I added that header to update.sh
• I re-ran ./update.sh. This time it succeeded.
• I checked the generated code (to check that everything is under an open source license) and committed the result.

In some cases these header files need a bit more massaging, see update.sh.