libxkbcommon: don't require 1.8.0

The version bump was done since we now use XKB_VMOD_NAME_*; macros
added in libxkbcommon 1.8.0.

Not all distros have updated libxkbcommon yet (read: Debian). Since
it's fairly easy to work around, let's do that.

Closes #2103

CHANGELOG.md

@@ -105,8 +105,11 @@
   instead of `10-bit`.
 * Allow setting either selection background, or selection foreground,
   only ([#1846][1846]).
+* Drop required version of libxkbcommon from 1.8.0 back to 1.0.0
+  ([#2103][2103]).
 
 [1846]: https://codeberg.org/dnkl/foot/issues/1846
+[2103]: https://codeberg.org/dnkl/foot/issues/2103
 
 
 ### Deprecated

input.c

@@ -40,6 +40,7 @@
 #include "url-mode.h"
 #include "util.h"
 #include "vt.h"
+#include "xkbcommon-vmod.h"
 #include "xmalloc.h"
 #include "xsnprintf.h"
 

key-binding.c

@@ -11,6 +11,7 @@
 #include "terminal.h"
 #include "util.h"
 #include "wayland.h"
+#include "xkbcommon-vmod.h"
 #include "xmalloc.h"
 
 struct vmod_map {

meson.build

@@ -319,6 +319,7 @@ executable(
   'url-mode.c', 'url-mode.h',
   'user-notification.c', 'user-notification.h',
   'wayland.c', 'wayland.h', 'shm-formats.h',
+  'xkbcommon-vmod.h',
   srgb_funcs, wl_proto_src + wl_proto_headers, version,
   dependencies: [math, threads, libepoll, pixman, wayland_client, wayland_cursor, xkb, fontconfig, utf8proc,
                  tllist, fcft],

xkbcommon-vmod.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <xkbcommon/xkbcommon-names.h>
+
+/* Added in libxkbcommon 1.8.0 */
+#if !defined(XKB_VMOD_NAME_ALT)
+/* Common *virtual* modifiers, encoded in xkeyboard-config in the compat and
+ * symbols files. They have been stable since the beginning of the project and
+ * are unlikely to ever change. */
+#define XKB_VMOD_NAME_ALT       "Alt"
+#define XKB_VMOD_NAME_HYPER     "Hyper"
+#define XKB_VMOD_NAME_LEVEL3    "LevelThree"
+#define XKB_VMOD_NAME_LEVEL5    "LevelFive"
+#define XKB_VMOD_NAME_META      "Meta"
+#define XKB_VMOD_NAME_NUM       "NumLock"
+#define XKB_VMOD_NAME_SCROLL    "ScrollLock"
+#define XKB_VMOD_NAME_SUPER     "Super"
+#endif