Update to v103r20 release.

byuu says:

Changelog:

  - ruby/audio/xaudio2: ported to new ruby API
  - ruby/video/cgl: ported to new ruby API (untested, won't compile)
  - ruby/video/directdraw: ported to new ruby API
  - ruby/video/gdi: ported to new ruby API
  - ruby/video/glx: ported to new ruby API
  - ruby/video/wgl: ported to new ruby API
  - ruby/video/opengl: code cleanups

The macOS CGL driver is sure to have compilation errors. If someone will
post the compilation error log, I can hopefully fix it in one or two
iterations of WIPs.

I am unable to test the Xorg GLX driver, because my FreeBSD desktop
video card drivers do not support OpenGL 3.2. If the driver doesn't
work, I'm going to need help tracking down what broke from the older
releases.

The real fun is still yet to come ... all the Linux-only drivers, where
I don't have a single Linux machine to test with.

Todo:

  - libco/fiber
  - libco/ucontext (I should really just delete this)
  - tomoko: hide main UI window when in exclusive fullscreen mode

amd64.c

@@ -1,9 +1,3 @@
-/*
-  libco.amd64 (2016-09-14)
-  author: byuu
-  license: public domain
-*/
-
 #define LIBCO_C
 #include "libco.h"
 #include "settings.h"

arm.c

@@ -1,9 +1,3 @@
-/*
-  libco.arm (2016-09-14)
-  author: byuu
-  license: public domain
-*/
-
 #define LIBCO_C
 #include "libco.h"
 #include "settings.h"

fiber.c

@@ -1,9 +1,3 @@
-/*
-  libco.win (2008-01-28)
-  authors: Nach, byuu
-  license: public domain
-*/
-
 #define LIBCO_C
 #include "libco.h"
 

libco.c

@@ -1,8 +1,3 @@
-/*
-  libco
-  license: public domain
-*/
-
 #if defined(__clang__)
   #pragma clang diagnostic ignored "-Wparentheses"
 #endif

ppc.c

@@ -1,9 +1,3 @@
-/*
-  libco.ppc (2016-09-14)
-  author: blargg
-  license: public domain
-*/
-
 #define LIBCO_C
 #include "libco.h"
 #include "settings.h"

sjlj.c

@@ -1,9 +1,3 @@
-/*
-  libco.sjlj (2008-01-28)
-  author: Nach
-  license: public domain
-*/
-
 /*
   note this was designed for UNIX systems. Based on ideas expressed in a paper by Ralf Engelschall.
   for SJLJ on other systems, one would want to rewrite springboard() and co_create() and hack the jmb_buf stack pointer.
@@ -11,6 +5,7 @@
 
 #define LIBCO_C
 #include "libco.h"
+#include "settings.h"
 
 #define _XOPEN_SOURCE 500
 #include <stdlib.h>

ucontext.c

@@ -1,9 +1,3 @@
-/*
-  libco.ucontext (2008-01-28)
-  author: Nach
-  license: public domain
-*/
-
 /*
   WARNING: the overhead of POSIX ucontext is very high,
   assembly versions of libco or libco_sjlj should be much faster

x86.c

@@ -1,9 +1,3 @@
-/*
-  libco.x86 (2016-09-14)
-  author: byuu
-  license: public domain
-*/
-
 #define LIBCO_C
 #include "libco.h"
 #include "settings.h"