1.49.1: the enum headers upstream installs and this fork did not (#1)

wlroots 0.20 has `#include <wayland-protocols/xdg-shell-enum.h>` in ten of its
PUBLIC headers. Upstream wayland-protocols installs those — include/wayland-
protocols/meson.build runs `wayland-scanner enum-header` over every XML — and
genproto.sh here generated only client-header, server-header and public-code.
So a consumer of wlroots writing the ordinary `#include <wlr/...>` had nothing
to resolve them against.

The enum header carries only the protocol's enums: no interface symbols, no
libwayland dependency. That is why it is installed separately — a header that
wants to name `enum xdg_toplevel_state` gets it without pulling in a
marshalling table it would then have to link.

⭐ WHY CHECKED IN RATHER THAN GENERATED BY build.mcpp

§14 of the graphics-stack design doc says generation belongs in build.mcpp, not
in checked-in artifacts. It cannot apply here, and the reason is measured
(2026-08-31, two-package probe):

  mcpp::include_dir() from a build program   →  PACKAGE-PRIVATE, consumer
                                                gets 'No such file or directory'
  [build] include_dirs in the manifest       →  propagates to consumers

A package whose PRODUCT is headers therefore cannot produce them at build
time. That is a real limit of the mechanism, not a legacy shortcut in this
fork, and it is written into each member's manifest so the next person does
not spend the afternoon I would have.

VERSION: 1.49.1, third component = this fork's revision (upstream ships
two-component versions; 1.49 is newest). Not a re-cut of 1.49, because the
store is keyed by (name, version) and would not re-extract it — additive
content, additive version.

65 protocols × 1 new header. No existing generated file changes; the CI's
regenerate-and-diff step passes unmodified.

Author: Sunrisepeak

mcpp/generated/wayland-protocols/alpha-modifier-v1-enum.h

@@ -0,0 +1,34 @@
+/* Generated by wayland-scanner 1.26.0 */
+
+#ifndef ALPHA_MODIFIER_V1_ENUM_PROTOCOL_H
+#define ALPHA_MODIFIER_V1_ENUM_PROTOCOL_H
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+#ifndef WP_ALPHA_MODIFIER_V1_ERROR_ENUM
+#define WP_ALPHA_MODIFIER_V1_ERROR_ENUM
+enum wp_alpha_modifier_v1_error {
+	/**
+	 * wl_surface already has a alpha modifier object
+	 */
+	WP_ALPHA_MODIFIER_V1_ERROR_ALREADY_CONSTRUCTED = 0,
+};
+#endif /* WP_ALPHA_MODIFIER_V1_ERROR_ENUM */
+
+#ifndef WP_ALPHA_MODIFIER_SURFACE_V1_ERROR_ENUM
+#define WP_ALPHA_MODIFIER_SURFACE_V1_ERROR_ENUM
+enum wp_alpha_modifier_surface_v1_error {
+	/**
+	 * wl_surface was destroyed
+	 */
+	WP_ALPHA_MODIFIER_SURFACE_V1_ERROR_NO_SURFACE = 0,
+};
+#endif /* WP_ALPHA_MODIFIER_SURFACE_V1_ERROR_ENUM */
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif