[gtkmm/gtkmm-3-24] meson.build: use relative path

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 4d4664e04145492185668f9a8e0f383a82c97164
Author: Mingli Yu <mingli yu windriver com>
Date:   Tue Feb 23 16:57:03 2021 +0800

    meson.build: use relative path
    
    Fixes:
    Fatal error: can't create
    
gdk/gdkmm/libgdkmm-3.0.so.1.1.0.p/_buildarea1_master-wr_build_Userspace_auto-usrmerge_standalone_usrmerge_next_210222_lxbuilds_Har12345_platform_up_intel-x86-64-standard-glibc-std_wrlinux_build_tmp-glibc_work_corei7-64-wrs-linux_gtkmm3_3.24.3-r0_gtkmm-3.24.3_untracked_gdk_gdkmm_timecoord.cc.o:
 File name too long
    
    Signed-off-by: Mingli Yu <mingli yu windriver com>

 gdk/gdkmm/meson.build | 4 ++--
 gtk/gtkmm/meson.build | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/gdk/gdkmm/meson.build b/gdk/gdkmm/meson.build
index afccaea0..0832b106 100644
--- a/gdk/gdkmm/meson.build
+++ b/gdk/gdkmm/meson.build
@@ -200,9 +200,9 @@ else # not maintainer_mode
     gdkmm_hg_ccg_basenames,
   )
 
-  built_cc_files = [ src_untracked_gdkmm / 'wrap_init.cc' ]
+  built_cc_files = [ '../..' / untracked_gdkmm / 'wrap_init.cc' ]
   foreach file : gdkmm_used_hg_ccg_basenames
-    built_cc_files += src_untracked_gdkmm / file + '.cc'
+    built_cc_files += '../..' / untracked_gdkmm / file + '.cc'
   endforeach
 
   gdk_gen_sources = built_cc_files
diff --git a/gtk/gtkmm/meson.build b/gtk/gtkmm/meson.build
index ab96a221..2a2ba545 100644
--- a/gtk/gtkmm/meson.build
+++ b/gtk/gtkmm/meson.build
@@ -464,9 +464,9 @@ else # not maintainer_mode
     gtkmm_hg_ccg_basenames,
   )
 
-  built_cc_files = [ src_untracked_gtkmm / 'wrap_init.cc' ]
+  built_cc_files = [ '../..' / untracked_gtkmm / 'wrap_init.cc' ]
   foreach file : gtkmm_used_hg_ccg_basenames
-    built_cc_files += src_untracked_gtkmm / file + '.cc'
+    built_cc_files += '../..' / untracked_gtkmm / file + '.cc'
   endforeach
 
   gtk_gen_sources = built_cc_files