Add type definitions for stdint.h and stddef.h

Fixes #749

lib/ffi/platform/x86_64-linux/types.conf

@@ -73,6 +73,15 @@ rbx.platform.typedef.int16_t = short
 rbx.platform.typedef.int32_t = int
 rbx.platform.typedef.int64_t = long
 rbx.platform.typedef.int8_t = char
+rbx.platform.typedef.int_fast16_t = long
+rbx.platform.typedef.int_fast32_t = long
+rbx.platform.typedef.int_fast64_t = long
+rbx.platform.typedef.int_fast8_t = char
+rbx.platform.typedef.int_least32_t = int
+rbx.platform.typedef.int_least64_t = long
+rbx.platform.typedef.int_least8_t = char
+rbx.platform.typedef.intmax_t = long
+rbx.platform.typedef.intptr_t = long
 rbx.platform.typedef.key_t = int
 rbx.platform.typedef.loff_t = long
 rbx.platform.typedef.mode_t = uint
@@ -82,6 +91,7 @@ rbx.platform.typedef.pid_t = int
 rbx.platform.typedef.pthread_key_t = uint
 rbx.platform.typedef.pthread_once_t = int
 rbx.platform.typedef.pthread_t = ulong
+rbx.platform.typedef.ptrdiff_t = long
 rbx.platform.typedef.quad_t = long
 rbx.platform.typedef.register_t = long
 rbx.platform.typedef.rlim_t = ulong
@@ -107,5 +117,16 @@ rbx.platform.typedef.uint16_t = ushort
 rbx.platform.typedef.uint32_t = uint
 rbx.platform.typedef.uint64_t = ulong
 rbx.platform.typedef.uint8_t = uchar
+rbx.platform.typedef.uint_fast16_t = ulong
+rbx.platform.typedef.uint_fast32_t = ulong
+rbx.platform.typedef.uint_fast64_t = ulong
+rbx.platform.typedef.uint_fast8_t = uchar
+rbx.platform.typedef.uint_least16_t = ushort
+rbx.platform.typedef.uint_least32_t = uint
+rbx.platform.typedef.uint_least64_t = ulong
+rbx.platform.typedef.uint_least8_t = uchar
+rbx.platform.typedef.uintmax_t = ulong
+rbx.platform.typedef.uintptr_t = ulong
 rbx.platform.typedef.ulong = ulong
 rbx.platform.typedef.ushort = ushort
+rbx.platform.typedef.wchar_t = int

lib/ffi/tools/types_generator.rb

@@ -47,6 +47,8 @@ def self.generate(options = {})
       typedefs = nil
       Tempfile.open 'ffi_types_generator' do |io|
         io.puts <<-C
+#include <stdint.h>
+#include <stddef.h>
 #include <sys/types.h>
 #if !(defined(WIN32))
 #include <sys/socket.h>