efl: remove lstat and fchmod checks.
- fchmod() was isolated by HAVE_CHMOD, which was always present before... then fchmod() is also present as no errors were reported since its introduction.
- fchmod() is POSIX for a while now.
- lstat() is POSIX for a while now.
- setxattr is supported by EFL_CHECK_FUNCS() as is used by eina.
- splice() check added to EFL_CHECK_FUNCS()