temporary: revert bug#75606 fix.

Author: bhaible

build-tarball.sh

@@ -40,6 +40,7 @@ git clone --depth 1 "$gnulib_url"
 # Apply patches.
 (cd "$package" && patch -p1 < ../patches/cygwin32-failure.patch)
 (cd "$package" && patch -p1 < ../patches/expected-failures.patch)
+(cd "$package" && patch -p1 < ../patches/revert-75606-fix.diff) # temporary
 (cd coreutils && rm -f gl/modules/link-tests.diff && sed -i -e '/link-tests.diff/d' gl/local.mk)
 (cd coreutils && rm -f gl/modules/rename-tests.diff && sed -i -e '/rename-tests.diff/d' gl/local.mk)
 (cd gnulib && patch -p1 < ../patches/ubsan.diff)

patches/revert-75606-fix.diff

@@ -0,0 +1,17 @@
+diff --git a/src/sort.c b/src/sort.c
+index 0928fd57c..997566240 100644
+--- a/src/sort.c
++++ b/src/sort.c
+@@ -2373,11 +2373,7 @@ debug_key (struct line const *line, struct keyfield const *key)
+       if (key->sword != SIZE_MAX)
+         beg = begfield (line, key);
+       if (key->eword != SIZE_MAX)
+-        {
+-          lim = limfield (line, key);
+-          /* Treat field ends before field starts as empty fields.  */
+-          lim = MAX (beg, lim);
+-        }
++        lim = limfield (line, key);
+ 
+       if ((key->skipsblanks && key->sword == SIZE_MAX)
+           || key->month || key_numeric (key))