Update function binding to match actual return types.

Author: nirvdrum

src/main/ruby/core/posix.rb

@@ -181,7 +181,7 @@ def self.attach_function_eagerly(native_name, argument_types, return_type,
   attach_function :fcntl, [:int, :int, :int], :int
   attach_function :truffleposix_flock, [:int, :int], :int, LIBTRUFFLEPOSIX, true
   attach_function :truffleposix_fstat, [:int, :pointer], :int, LIBTRUFFLEPOSIX
-  attach_function :truffleposix_fstat_mode, [:int], :long, LIBTRUFFLEPOSIX
+  attach_function :truffleposix_fstat_mode, [:int], :mode_t, LIBTRUFFLEPOSIX
   attach_function :truffleposix_fstat_size, [:int], :long, LIBTRUFFLEPOSIX
   attach_function :fsync, [:int], :int
   attach_function :ftruncate, [:int, :off_t], :int
@@ -193,7 +193,7 @@ def self.attach_function_eagerly(native_name, argument_types, return_type,
   attach_function :link, [:string, :string], :int
   attach_function :lseek, [:int, :off_t, :int], :off_t
   attach_function :truffleposix_lstat, [:string, :pointer], :int, LIBTRUFFLEPOSIX
-  attach_function :truffleposix_lstat_mode, [:string], :long, LIBTRUFFLEPOSIX
+  attach_function :truffleposix_lstat_mode, [:string], :mode_t, LIBTRUFFLEPOSIX
   attach_function :truffleposix_major, [:dev_t], :uint, LIBTRUFFLEPOSIX
   attach_function :truffleposix_minor, [:dev_t], :uint, LIBTRUFFLEPOSIX
   attach_function :mkdir, [:string, :mode_t], :int
@@ -210,7 +210,7 @@ def self.attach_function_eagerly(native_name, argument_types, return_type,
   attach_function :seekdir, [:pointer, :long], :void
   attach_function :truffleposix_select, [:int, :pointer, :int, :pointer, :int, :pointer, :long], :int, LIBTRUFFLEPOSIX
   attach_function :truffleposix_stat, [:string, :pointer], :int, LIBTRUFFLEPOSIX
-  attach_function :truffleposix_stat_mode, [:string], :long, LIBTRUFFLEPOSIX
+  attach_function :truffleposix_stat_mode, [:string], :mode_t, LIBTRUFFLEPOSIX
   attach_function :truffleposix_stat_size, [:string], :long, LIBTRUFFLEPOSIX
   attach_function :symlink, [:string, :string], :int
   attach_function :telldir, [:pointer], :long