Update from gnulib

This incorporates:
2018-07-17 gnulib-tool: limit line length for git send-email
* lib/gnulib.mk.in: Regenerate.

lib/gnulib.mk.in

@@ -20,7 +20,123 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=close --avoid=dup --avoid=fchdir --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd --avoid=select --avoid=setenv --avoid=sigprocmask --avoid=stat --avoid=stdarg --avoid=stdbool --avoid=threadlib --avoid=tzset --avoid=unsetenv --avoid=utime --avoid=utime-h --gnu-make --makefile-name=gnulib.mk.in --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt binary-io byteswap c-ctype c-strcase careadlinkat close-stream count-leading-zeros count-one-bits count-trailing-zeros crypto/md5-buffer crypto/sha1-buffer crypto/sha256-buffer crypto/sha512-buffer d-type diffseq dtoastr dtotimespec dup2 environ execinfo explicit_bzero faccessat fcntl fcntl-h fdatasync fdopendir filemode filevercmp flexmember fpieee fstatat fsusage fsync getloadavg getopt-gnu gettime gettimeofday gitlog-to-changelog ignore-value intprops largefile lstat manywarnings memrchr minmax mkostemp mktime nstrftime pipe2 pselect pthread_sigmask putenv qcopy-acl readlink readlinkat sig2str socklen stat-time std-gnu11 stdalign stddef stdio stpcpy strtoimax symlink sys_stat sys_time tempname time time_r time_rz timegm timer-time timespec-add timespec-sub unlocked-io update-copyright utimens vla warnings
+# Reproduce by:
+# gnulib-tool --import \
+#  --lib=libgnu \
+#  --source-base=lib \
+#  --m4-base=m4 \
+#  --doc-base=doc \
+#  --tests-base=tests \
+#  --aux-dir=build-aux \
+#  --gnu-make \
+#  --makefile-name=gnulib.mk.in \
+#  --conditional-dependencies \
+#  --no-libtool \
+#  --macro-prefix=gl \
+#  --no-vc-files \
+#  --avoid=close \
+#  --avoid=dup \
+#  --avoid=fchdir \
+#  --avoid=fstat \
+#  --avoid=malloc-posix \
+#  --avoid=msvc-inval \
+#  --avoid=msvc-nothrow \
+#  --avoid=openat-die \
+#  --avoid=opendir \
+#  --avoid=raise \
+#  --avoid=save-cwd \
+#  --avoid=select \
+#  --avoid=setenv \
+#  --avoid=sigprocmask \
+#  --avoid=stat \
+#  --avoid=stdarg \
+#  --avoid=stdbool \
+#  --avoid=threadlib \
+#  --avoid=tzset \
+#  --avoid=unsetenv \
+#  --avoid=utime \
+#  --avoid=utime-h \
+#  alloca-opt \
+#  binary-io \
+#  byteswap \
+#  c-ctype \
+#  c-strcase \
+#  careadlinkat \
+#  close-stream \
+#  count-leading-zeros \
+#  count-one-bits \
+#  count-trailing-zeros \
+#  crypto/md5-buffer \
+#  crypto/sha1-buffer \
+#  crypto/sha256-buffer \
+#  crypto/sha512-buffer \
+#  d-type \
+#  diffseq \
+#  dtoastr \
+#  dtotimespec \
+#  dup2 \
+#  environ \
+#  execinfo \
+#  explicit_bzero \
+#  faccessat \
+#  fcntl \
+#  fcntl-h \
+#  fdatasync \
+#  fdopendir \
+#  filemode \
+#  filevercmp \
+#  flexmember \
+#  fpieee \
+#  fstatat \
+#  fsusage \
+#  fsync \
+#  getloadavg \
+#  getopt-gnu \
+#  gettime \
+#  gettimeofday \
+#  gitlog-to-changelog \
+#  ignore-value \
+#  intprops \
+#  largefile \
+#  lstat \
+#  manywarnings \
+#  memrchr \
+#  minmax \
+#  mkostemp \
+#  mktime \
+#  nstrftime \
+#  pipe2 \
+#  pselect \
+#  pthread_sigmask \
+#  putenv \
+#  qcopy-acl \
+#  readlink \
+#  readlinkat \
+#  sig2str \
+#  socklen \
+#  stat-time \
+#  std-gnu11 \
+#  stdalign \
+#  stddef \
+#  stdio \
+#  stpcpy \
+#  strtoimax \
+#  symlink \
+#  sys_stat \
+#  sys_time \
+#  tempname \
+#  time \
+#  time_r \
+#  time_rz \
+#  timegm \
+#  timer-time \
+#  timespec-add \
+#  timespec-sub \
+#  unlocked-io \
+#  update-copyright \
+#  utimens \
+#  vla \
+#  warnings
 
 
 MOSTLYCLEANFILES += core *.stackdump