Merged update from upstream sources

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Source: https://src.fedoraproject.org/rpms/m4.git#dec446dc1dd93424347572db6f35d406ae39d1af

m4.spec

@@ -1,13 +1,14 @@
-Summary: The GNU macro processor
+Summary: GNU macro processor
 Name: m4
 Version: 1.4.18
-Release: 16%{?dist}
+Release: 17%{?dist}
 License: GPLv3+
-Source0: http://ftp.gnu.org/gnu/m4/m4-%{version}.tar.xz
+Source0: https://ftp.gnu.org/gnu/m4/m4-%{version}.tar.xz
-Source1: http://ftp.gnu.org/gnu/m4/m4-%{version}.tar.xz.sig
+Source1: https://ftp.gnu.org/gnu/m4/m4-%{version}.tar.xz.sig
 # Patch0: update to glibc libio.h removal, rhbz#1573342
 Patch0: m4-1.4.18-glibc-change-work-around.patch
-URL: http://www.gnu.org/software/m4/
+URL: https://www.gnu.org/software/m4/
+BuildRequires: make
 BuildRequires: gcc autoconf automake
 %ifarch ppc ppc64
 BuildRequires: texinfo
@@ -51,6 +52,9 @@ make %{?_smp_mflags} check
 %{_mandir}/man1/m4.1*
 
 %changelog
+* Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.4.18-17
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
+
 * Tue Oct 13 2020 Vitezslav Crhonek <vcrhonek@redhat.com> - 1.4.18-16
 - Drop workaround introduced in previous release
   Resolves: #1864107