gtkmm4: update to 4.12.0.

srcpkgs/gtkmm4/patches/setlocale-sigsegv.patch

@@ -0,0 +1,17 @@
+passing std::setlocale output to std::locale segfaults,
+get the locale with std::locale("") instead.
+--
+diff --git a/untracked/gtk/gtkmm/application.cc b/untracked/gtk/gtkmm/application.cc
+index 0f8d7a0..22c1c8b 100644
+--- a/untracked/gtk/gtkmm/application.cc
++++ b/untracked/gtk/gtkmm/application.cc
+@@ -74,7 +74,8 @@ static void set_cxx_locale_to_c_locale()
+   try
+   {
+     // Make the C++ locale equal to the C locale.
+-    std::locale::global(std::locale(std::setlocale(LC_ALL, nullptr)));
++    // std::locale::global(std::locale(std::setlocale(LC_ALL, nullptr)));
++    std::locale::global(std::locale(""));
+   }
+   catch (const std::runtime_error& ex)
+   {

srcpkgs/gtkmm4/template

@@ -1,6 +1,6 @@
 # Template file for 'gtkmm4'
 pkgname=gtkmm4
-version=4.4.0
+version=4.12.0
 revision=1
 build_style=meson
 hostmakedepends="pkg-config mm-common glib-devel"
@@ -12,7 +12,7 @@ license="LGPL-2.1-or-later"
 homepage="https://gtkmm.org"
 changelog="https://gitlab.gnome.org/GNOME/gtkmm/-/raw/master/NEWS"
 distfiles="${GNOME_SITE}/gtkmm/${version%.*}/gtkmm-${version}.tar.xz"
-checksum=2eb464326096e6a40c82e9cd074164d8103fb5e07865679c0a649e4174700dda
+checksum=fbc3e7618123345c0148ef71abb6548d421f52bb224fbda34875b677dc032c92
 
 do_check() {
 	xvfb-run ninja -C build test