[gtk: 1/2] Include `gdk-private.h` to fix error about `g_source_set_static_name`

[Matthias Clasen <matthiasc src gnome org>]

commit 2ceba0d31c40a916fc336d8662f1225710221cf8
Author: Mosè Giordano <mose gnu org>
Date:   Sat Feb 5 21:51:40 2022 +0000

    Include `gdk-private.h` to fix error about `g_source_set_static_name`
    
    Without this change we get the following error:
    
    ```
    [1/13] Compiling C object gdk/macos/libgdk-macos.a.p/gdkdisplaylinksource.c.o
    ninja: job failed: /opt/bin/aarch64-apple-darwin20-libgfortran5-cxx11/aarch64-apple-darwin20-clang 
-Igdk/macos/libgdk-macos.a.p -Igdk/macos -I../gdk/macos -I. -I.. -Igdk -I../gdk -Isubprojects/pango/pango 
-I../subprojects/pango/pango -Isubprojects/pango -I../subprojects/pango 
-I/workspace/destdir/include/gdk-pixbuf-2.0 -I/workspace/destdir/include 
-I/workspace/destdir/include/glib-2.0 -I/workspace/destdir/lib/glib-2.0/include 
-I/workspace/destdir/lib/libffi-3.2.1/include -I/workspace/destdir/include/libpng16 -I/usr/include/libmount 
-I/usr/include/blkid -I/workspace/destdir/include/cairo -I/workspace/destdir/include/pixman-1 
-I/workspace/destdir/include/freetype2 -I/workspace/destdir/include/fribidi 
-I/workspace/destdir/include/harfbuzz -I/workspace/destdir/include/graphene-1.0 
-I/workspace/destdir/lib/graphene-1.0/include -I/workspace/destdir/include/gio-unix-2.0 -fcolor-diagnostics 
-Wall -Winvalid-pch -std=gnu99 -O2 -g -DG_LOG_USE_STRUCTURED=1 -DGLIB_DISABLE_DEPRECATION_WARNINGS
  '-DGTK_VERSION="4.6.0"' -D_GNU_SOURCE -DG_ENABLE_DEBUG -DGTK_COMPILATION '-DG_LOG_DOMAIN="Gdk"' 
-xobjective-c -fno-strict-aliasing -Wno-c++11-extensions -Wno-missing-include-dirs -Wno-typedef-redefinition 
-Wformat=2 -Wformat-nonliteral -Wformat-security -Wignored-qualifiers -Wimplicit-function-declaration 
-Wmisleading-indentation -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn 
-Wnested-externs -Wold-style-definition -Wpointer-arith -Wshadow -Wstrict-prototypes -Wswitch-default 
-Wswitch-enum -Wundef -Wuninitialized -Wunused -Werror=address -Werror=array-bounds -Werror=empty-body 
-Werror=implicit -Werror=implicit-fallthrough -Werror=init-self -Werror=int-to-pointer-cast -Werror=main 
-Werror=missing-braces -Werror=missing-declarations -Werror=missing-prototypes -Werror=nonnull 
-Werror=pointer-to-int-cast -Werror=redundant-decls -Werror=return-type -Werror=sequence-point 
-Werror=trigraphs -Werror=vla -Werror=write-strings -Wnull-dereference -fvisibility=hidden -MD 
 -MQ gdk/macos/libgdk-macos.a.p/gdkdisplaylinksource.c.o -MF 
gdk/macos/libgdk-macos.a.p/gdkdisplaylinksource.c.o.d -o gdk/macos/libgdk-macos.a.p/gdkdisplaylinksource.c.o 
-c ../gdk/macos/gdkdisplaylinksource.c
    ../gdk/macos/gdkdisplaylinksource.c:201:3: error: implicit declaration of function 
'g_source_set_static_name' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
      g_source_set_static_name (source, "[gdk] quartz frame clock");
      ^
    1 error generated.
    ninja: subcommand failed
    ```

 gdk/macos/gdkdisplaylinksource.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gdk/macos/gdkdisplaylinksource.c b/gdk/macos/gdkdisplaylinksource.c
index 9587875dde..292b8be519 100644
--- a/gdk/macos/gdkdisplaylinksource.c
+++ b/gdk/macos/gdkdisplaylinksource.c
@@ -27,6 +27,7 @@
 #include "gdkdisplaylinksource.h"
 
 #include "gdkmacoseventsource-private.h"
+#include "gdk-private.h"
 
 static gint64 host_to_frame_clock_time (gint64 val);