Add a patch to improve the reproducibility of findutils

See the comment in the patch for more details.

sysa/findutils-4.2.33/findutils-4.2.33.sh

@@ -5,6 +5,8 @@
 src_prepare() {
     . ../../import-gnulib.sh
 
+    default_src_prepare
+
     autoreconf-2.61 -f
 
     # Pre-built texinfo files

sysa/findutils-4.2.33/patches/force-getcwd-fallback.patch

@@ -0,0 +1,18 @@
+SPDX-FileCopyrightText: 2022 Dor Askayo <dor.askayo@gmail.com>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+Use the fallback implementations of getcwd to get the same /usr/bin/find
+checksum when building across FUSE and non-FUSE filesystems.
+
+--- gnulib/m4/getcwd-path-max.m4	2022-01-08 13:16:54.412709192 +0200
++++ gnulib/m4/getcwd-path-max.m4	2022-01-16 11:38:02.658606802 +0200
+@@ -81,7 +81,7 @@
+   char *cwd = getcwd (buf, PATH_MAX);
+   size_t initial_cwd_len;
+   size_t cwd_len;
+-  int fail = 0;
++  int fail = 1;
+   size_t n_chdirs = 0;
+ 
+   if (cwd == NULL)