Port configure script to C99

Related to:

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

patch-configure-c99.patch

@@ -0,0 +1,31 @@
+Avoid an implicit declaration of mkdir in the fchownat probe.  Fixed
+in gnulib upstream via:
+
+commit 3c136a2cc38d71083f123231a8b9ad4b01930789
+Author: Bruno Haible <bruno@clisp.org>
+Date:   Thu Jan 24 23:51:11 2019 +0100
+
+    fchownat: Fix compilation error on Android 4.3.
+    
+    * lib/unistd.in.h: Include <sys/stat.h> when module 'fchownat' is in
+    use.
+    * m4/fchownat.m4 (gl_FUNC_FCHOWNAT_DEREF_BUG,
+    gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG): Include also <sys/stat.h>.
+    * doc/posix-functions/fchownat.texi: Mention the issue.
+
+The patched filed is not included in the upstream Git repository for
+patch, so presumably the next upstream release will sync the file from
+gnulib and get the fix this way.
+
+diff --git a/m4/fchownat.m4 b/m4/fchownat.m4
+index 54c670c7037246a4..b1a1287f80c297a0 100644
+--- a/m4/fchownat.m4
++++ b/m4/fchownat.m4
+@@ -86,6 +86,7 @@ AC_DEFUN([gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG],
+        [AC_LANG_PROGRAM(
+           [[#include <unistd.h>
+             #include <fcntl.h>
++	    #include <sys/stat.h>
+           ]],
+           [[int fd;
+             int ret;

patch.spec

@@ -3,7 +3,7 @@
 Summary: Utility for modifying/upgrading files
 Name: patch
 Version: 2.7.6
-Release: 18%{?dist}
+Release: 19%{?dist}
 License: GPLv3+
 URL: https://savannah.gnu.org/projects/patch/
 Source: https://ftp.gnu.org/gnu/patch/patch-%{version}.tar.xz
@@ -32,6 +32,7 @@ Patch21: patch-2.7.6-avoid-invalid-memory-access-in-context-format-diffs.patch
 Patch22: patch-2.7.6-CVE-2018-17942.patch
 Patch23: patch-2.7.6-failed_assertion.patch
 Patch100: patch-selinux.patch
+Patch101: patch-configure-c99.patch
 
 BuildRequires: make
 BuildRequires: gcc
@@ -84,6 +85,7 @@ applications.
 %patch23 -p1 -b .failed_assertion
 # SELinux support.
 %patch100 -p1 -b .selinux
+%patch101 -p1
 
 %build
 CFLAGS="$RPM_OPT_FLAGS -D_GNU_SOURCE"
@@ -107,6 +109,9 @@ make check
 %{_mandir}/*/*
 
 %changelog
+* Thu Feb 02 2023 Florian Weimer <fweimer@redhat.com> - 2.7.6-19
+- Port configure script to C99
+
 * Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 2.7.6-18
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild