[pangomm/pangomm-2-42] meson.build files: Fix references to other modules

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 1f462c792140adebd50b1d3720eed85f019d1bc0
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Sat Nov 9 12:13:15 2019 +0100

    meson.build files: Fix references to other modules
    
    * docs/reference/meson.build: Use tag files from sigc++-2.0, glibmm-2.4
    and cairomm-1.0.
    * tools/extra_defs_gen/meson.build: Use the generate_extra_defs library
    from glibmm-2.4.
    
    These files had been copied from the master branch but not enough modified.
    See https://mail.gnome.org/archives/gtkmm-list/2019-November/msg00001.html

 docs/reference/meson.build       | 6 +++---
 tools/extra_defs_gen/meson.build | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index eaa9a44..52087b8 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -7,9 +7,9 @@
 
 tag_file_modules = [
   'mm-common-libstdc++',
-  'sigc++-3.0',
-  'glibmm-2.64',
-  'cairomm-1.16',
+  'sigc++-2.0',
+  'glibmm-2.4',
+  'cairomm-1.0',
 ]
 doxygen_tagfiles = ''
 docinstall_flags = []
diff --git a/tools/extra_defs_gen/meson.build b/tools/extra_defs_gen/meson.build
index 35d9315..9be9d1e 100644
--- a/tools/extra_defs_gen/meson.build
+++ b/tools/extra_defs_gen/meson.build
@@ -5,7 +5,7 @@
 
 if not is_msvc
   glibmm_generate_extra_defs_dep = cpp_compiler.find_library(
-    'glibmm_generate_extra_defs-2.64',
+    'glibmm_generate_extra_defs-2.4',
   )
 
   executable('generate_extra_defs', 'generate_defs_pango.cc',