[gtk/wip/otte/gl-hdr] build: Add a HAVE_EGL define to config.h

[Benjamin Otte <otte src gnome org>]

commit 0d107d038d50f0a5faa5beb534d45847a0c3aaf2
Author: Benjamin Otte <otte redhat com>
Date:   Tue Oct 5 04:14:57 2021 +0200

    build: Add a HAVE_EGL define to config.h

 gdk/win32/meson.build |  2 +-
 meson.build           | 12 ++++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)
---
diff --git a/gdk/win32/meson.build b/gdk/win32/meson.build
index 93c55fa6d8..0177adaf83 100644
--- a/gdk/win32/meson.build
+++ b/gdk/win32/meson.build
@@ -48,7 +48,7 @@ install_headers(gdk_win32_public_headers, 'gdkwin32.h', subdir: 'gtk-4.0/gdk/win
 
 GDK_WIN32_EGL_CFLAGS = []
 
-if win32_has_egl
+if have_egl
   GDK_WIN32_EGL_CFLAGS = ['-DGDK_WIN32_ENABLE_EGL']
   gdk_win32_sources += ['gdkglcontext-win32-egl.c']
 endif
diff --git a/meson.build b/meson.build
index bea2015429..897de13766 100644
--- a/meson.build
+++ b/meson.build
@@ -481,7 +481,15 @@ if not cairo_csi_dep.found()
   cairo_csi_dep = cc.find_library('cairo-script-interpreter', required: get_option('build-tests'))
 endif
 
+have_egl = epoxy_dep.get_variable(
+  pkgconfig: 'epoxy_has_egl',
+  internal: 'epoxy_has_egl',
+  default_value: '0') == '1'
+
 cdata.set('HAVE_CAIRO_SCRIPT_INTERPRETER', cairo_csi_dep.found())
+if have_egl
+  cdata.set('HAVE_EGL', 1)
+endif
 cdata.set('HAVE_HARFBUZZ', harfbuzz_dep.found())
 cdata.set('HAVE_PANGOFT', pangoft_dep.found())
 
@@ -589,10 +597,6 @@ if win32_enabled
   pc_gdk_extra_libs += ['-lwinmm', '-ldwmapi', '-lsetupapi', '-lcfgmgr32']
 
   # Check whether libepoxy is built with EGL support on Windows
-  win32_has_egl = epoxy_dep.get_variable(
-    pkgconfig: 'epoxy_has_egl',
-    internal: 'epoxy_has_egl',
-    default_value: '0') == '1'
 endif
 
 # Check for bind_textdomain_codeset, including -lintl if GLib brings it in by