wl_keyboard version 4 is more recent than the libwayland available in
Ubuntu 14.04.

This had to bump the seat version, we now may get the seat name but we
don’t do anything with it.

This adds support for the + and - and ~ input modifiers for joystick
axes.  It also changes how joystick axes are translated to buttons to
more closely match SDL 2.0.7.

Output modifiers are still not supported but have not yet been seen in
the wild.

The switch to full screen is now done with a single call to
SetWindowPos.

Allow window creation despite video mode setting failure.

Video mode setting failure is ignored the rest of the time and the
desired video mode has never been a hard constraint anyway.

Broke build for me on CentOS-6, which sports a 2.6.32 kernel:
http://www.cpantesters.org/cpan/report/d956d128-0339-11e8-b0d1-b6c4abd39192

CentOS-6 is supported till 2020-11-30.

Closes #1196.

Related to #1143.
Fixes #1197.

Prevents #1197 from happening again.

Fixes #1197

Fixes #1193.

OpenGL / OpenGL ES cannot share presentation on a window with Vulkan.
This adds an error to `glfwCreateWindowSurface` when it is called on a
window without the GLFW_CLIENT_API hint set to GLFW_NO_API.  This
prevents undefined bahevior and hard to debug crashes.

Fixes #1194.
Closes #1205.

Fixes a segfault on glfwTerminate().

The specification says we must not attach a buffer until we’ve received
a configure event.

This protocol matches desktops much better than the deprecated
wl_shell, fixing a bunch of race conditions, removing undefined
behaviour, adding missing features, and generally providing a much more
user-friendly experience.

Since most compositors don’t support it yet, the wl_shell_surface role
is kept as fallback for now.

Added missing compilation instructions for Wayland build.