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 counter of batch files before trying to use it.

 sh_chars_dos[].  Ignore an escaped backslash inside a string
 quoted with "..".  This lifts the 4KB or 8KB command-line length
 limitation imposed by the Windows shell when a command uses quoted
 strings, because we now don't call the shell in that case.

 job.c (reap_children): Add debug message for when removal of a temporary
 batch file fails.

 job.c (create_batch_file): Declare the counter of batch files
 static, to avoid having 2 jobs using the same file name and
 stepping on each other's toes.  When all 64K names are used up,
 make one more loop looking for slots that became vacant.  This
 avoids leaving behind temporary batch files in the temporary
 directory, which happens frequently on a fast machine when using
 parallel builds.

Provides support for dynamically loadable objects in GNU make, as a
"technology preview".

Fixes Savannah bug #32247

parent needs to be remade.  Fixes Savannah bug #30653.

Fixes Savannah bug #36451.

explicitly with stat(2).  Fixes Savannah bug #35919.

Fixes Savannah bug #35764.

Fixes Savannah bug #36925.

Fixes Savannah bug #36106.

 read.c (unescape_char): Advance 'p' after copying the unescaped
 characters.  Otherwise the backslashes are incorrectly erased from
 the original string.

The new GNU Maintainer's Manual allows the use of year ranges in certain
situations; take advantage of this simplification.

Fixes Savannah bug #12126 and bug #16545

Fixes Savannah bug #35468.

Fixes Savannah bug #32485

Fixes Savannah bug #34530.

See Savannah bug #35397.

Also add a valgrind suppression file for Guile-enabled make.

We fixed Savannah 16670 but that broke previously-working makefiles
that relied on the GNU make behavior.  The POSIX behavior doesn't
seem to me to be better, and can be obtained using GNU make as well,
so put it back as the default behavior and require .POSIX to
get the POSIX behavior.
Add a new section to the manual discussing backslash/newline handling.
Update the test suite.

Fixes Savannah bug #35525

 w32/subproc/sub_proc.c (proc_stdin_thread, proc_stdout_thread)
 (proc_stderr_thread, process_pipe_io): Ifdef away unused
 functions.

 w32/subproc/w32err.c (map_windows32_error_to_string) [_MSC_VER]:
 Don't use TLS storage for szMessageBuffer.  Ifdef away special
 code for handling Winsock error codes.  Make the function return a
 `const char *'.  Suggested by Ozkan Sezer.  Fixes Savannah bug #34832.

In Guile 2.0, (define ...) results in a variable object.  Ensure make
converts that to an empty string to avoid spurious errors.

The next POSIX standard will define "::=" to have the same behavior
as GNU make's ":=", so add support for this new operator.

Don't support Guile 1.6 and use a portable test for printable strings.