Reverting wrong commit.

Restore sysdeps/gnu/configure wrongly modified on
ef26eece63.

sysdeps/gnu/configure

@@ -0,0 +1,42 @@
+# This file is generated from configure.in by Autoconf.  DO NOT EDIT!
+
+# Local configure fragment for sysdeps/gnu.
+
+# The Filesystem Hierarchy Standard prescribes where to place "essential"
+# files.  I.e., when the installation prefix is "/usr" we have to place
+# shared library objects and the configuration files on the root partition
+# in /lib and /etc.
+case "$prefix" in
+/usr | /usr/)
+  # 64-bit libraries on bi-arch platforms go in /lib64 instead of /lib.
+  # Allow earlier configure scripts to handle libc_cv_slibdir, libdir,
+  # and libc_cv_localedir.
+  test -n "$libc_cv_slibdir" || \
+  case $machine in
+  sparc/sparc64 | x86_64* | powerpc/powerpc64 | s390/s390-64)
+    libc_cv_slibdir=/lib64
+    if test "$libdir" = '${exec_prefix}/lib'; then
+      libdir='${exec_prefix}/lib64';
+      # Locale data can be shared between 32bit and 64bit libraries
+      libc_cv_localedir='${exec_prefix}/lib/locale'
+    fi
+    ;;
+  *)
+    libc_cv_slibdir=/lib
+    ;;
+  esac
+  # Allow the user to override the path with --sysconfdir.
+  if test "$sysconfdir" = '${prefix}/etc'; then
+    libc_cv_sysconfdir=/etc
+  else
+    libc_cv_sysconfdir=$sysconfdir
+   fi
+  # Allow the user to override the path with --localstatedir.
+  if test "$localstatedir" = '${prefix}/var'; then
+    libc_cv_localstatedir=/var
+  else
+    libc_cv_localstatedir=$localstatedir
+   fi
+  libc_cv_rootsbindir=/sbin
+  ;;
+esac