Merged update from upstream sources

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Source: https://src.fedoraproject.org/rpms/gtkmm30.git#f180c16f66c685025be73a11d5293b4cb56e1408

gtkmm30.spec

@@ -11,7 +11,7 @@
 
 Name:           gtkmm30
 Version:        3.24.2
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        C++ interface for the GTK+ library
 
 License:        LGPLv2+
@@ -67,6 +67,9 @@ cp -a demos/ _docs/
 
 
 %build
+# Disable LTO to work around https://bugzilla.redhat.com/show_bug.cgi?id=1898054
+%define _lto_cflags %{nil}
+
 %configure --disable-static
 
 # fix lib64 rpaths
@@ -107,6 +110,9 @@ find $RPM_BUILD_ROOT -name '*.la' -exec rm -f {} ';'
 
 
 %changelog
+* Sat Nov 21 2020 Andrew Potter <agpotter@gmail.com> - 3.24.2-4
+- Opt-out of LTO (#1898054)
+
 * Tue Jul 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 3.24.2-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild