Port configure script to C99

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

mc-configure-c99.patch

@@ -0,0 +1,18 @@
+Include <fcntl.h> for the declaration of posix_fallocate.  This
+avoids an implicit function declaration and build issues with future
+compilers.
+
+Submitted upstream: <https://midnight-commander.org/ticket/4438>
+
+diff --git a/m4.include/mc-get-fs-info.m4 b/m4.include/mc-get-fs-info.m4
+index 5afc9f1bb938bfcd..403045aadc810ba7 100644
+--- a/m4.include/mc-get-fs-info.m4
++++ b/m4.include/mc-get-fs-info.m4
+@@ -8,6 +8,7 @@ AC_DEFUN([gl_POSIX_FALLOCATE], [
+     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+         #define _XOPEN_SOURCE 600
+         #include <stdlib.h>
++        #include <fcntl.h>
+         #if defined(__GLIBC__) && (__GLIBC__ < 2 || __GLIBC_MINOR__ < 7)
+             possibly broken posix_fallocate
+         #endif

mc.spec

@@ -5,7 +5,7 @@ Summary:	User-friendly text console file manager and visual shell
 Name:		mc
 Epoch:		1
 Version: 	4.8.28
-Release:	4%{?dist}
+Release:	5%{?dist}
 License:	GPL-3.0-or-later
 URL:		https://midnight-commander.org/
 VCS:		https://github.com/MidnightCommander/mc/
@@ -15,6 +15,7 @@ Patch:		%{name}-python3.patch
 Patch:		%{name}-default_setup.patch
 Patch:		%{name}-tmpdir.patch
 Patch:		%{VCS}/commit/34d3726b.patch#/%{name}-Ticket-4374-fix-file-sort-by-version.patch
+Patch:		mc-configure-c99.patch
 BuildRequires:	autoconf
 BuildRequires:	automake
 BuildRequires:	gcc
@@ -102,6 +103,9 @@ Midnight Commander s3+ and UC1541 EXTFS backend scripts.
 %{_libexecdir}/mc/extfs.d/{s3+,uc1541}
 
 %changelog
+* Sun Feb 05 2023 Florian Weimer <fweimer@redhat.com> - 1:4.8.28-5
+- Port configure script to C99
+
 * Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 1:4.8.28-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild