* Add support code

* Explicitly reference ANSI Windows APIs

* Adapt Sys.is_directory

* Adapt ocamlrun

* Add Changes entry

* Add testsuite

* Adapt Unix.open_process{_in,_out,_full,}, Unix.create_process{_env,}

* Adapt headernt.c

* Adapt Pervasives.open_{in,out}, Filename.temp_file, etc.

* Adapt Sys.file_exists

* Adapt Sys.remove

* Adapt Sys.chdir

* Adapt Sys.getcwd

* Adapt Sys.getenv

* Adapt Sys.command

* Adapt Sys.readdir

* Adapt CPLUGINS

* Remove use of FormatMessageA, CreateFileA

* Adapt Unix.mkdir

* Adapt Unix.openfile

* Adapt Unix.readlink

* Adapt Unix.rename

* Adapt Unix.{LargeFile,}.{l,}stat

* Adapt Unix.system

* Adapt Unix.{open,read}dir

* Adapt Unix.link

* Adapt Unix.symlink

* Adapt Unix.getcwd

* Adapt Unix.rmdir

* Adapt Unix.utimes

* Adapt Unix.unlink

* Adapt Unix.chdir

* Adapt Unix.chmod

* Adapt Unix.{execv,execve,execvp,execvpe}

* Compile with -DUNICODE -D_UNICODE under Windows

* Add configure-time switch, Config.windows_unicode

* Adapt Unix.putenv

* Re-implement Unix.environment using GetEnvironmentStrings()

* Use Unicode-aware flexdll

* Adapt Unix.environment

* AppVeyor: bootstrap flexdll

* Adapt tests/embedded/cmmain.c

* Adapt tests/lib-dynlink-csharp/entry.c

* Remove exec tests

* Fixup

* Pass -municode to MinGW compiler

* Try to fix tests/embedded

* Adapt Sys.rename

* Correct Changes entry

* Makefile.several: use $(O) and $(NATIVECODE_ONLY)

* Display => skipped correctly for tests/win-unicode

* Add missing casts to execv* calls

It's not clear why these aren't necessary for with char, but they are
necessary with wchar_t on GCC (but not MSVC).

* Missing header in systhreads (Win32 only)

* Revert "Pass -municode to MinGW compiler"

This reverts commit a4ce7fb319c429068a5b9d1ab14a2cc3969c355f.

* Revert "Try to fix tests/embedded"

This reverts commit 5197d8922295b7b339b970ec3189374aa15de4b8.

* Revert "Remove exec tests"

This reverts commit 306ccef2e79eca5b38ecfa285b912c7bcf3e9f52.

* Don't pass $(LDFLAGS) when build ocamlc.opt

It's already included via CC anyway, and it causes Unicode problems for
Winodws (because the linker options need to be prefixed "-link" to go via
flexlink).

* Use wmain on Windows for ocamlrun

* Build Unicode applications on Windows

* Use wmain in headernt.c

* Minor correction to win-unicode Makefile

* Switch submodule to FlexDLL 0.36

* Build ocamlyacc as an ANSI application

* Revert "Fixup"

This reverts commit 500bd6b575ffd6c5b71c6953e55d740f0b090185.

* Fix casts for execvp/execve

* Remove tabs from test code

* Fix Changes entry

* shell32.lib is no longer necessary

* Free allocated string

* Changes: signal breaking change

* Disable exec_tests

* Protect with CAML_INTERNALS

This commit moves:
  - config/m.h to byterun/caml/m.h
  - config/s.h to byterun/caml/s.h

Consequently, m.h and s.h now get installed alongside other
OCaml header files.

This commit also updates the .depend files, introducing updates in the
dependencies which are not consequences of this commit itself.

The Cygwin packages for awk, grep and sed were updated on 20 February
2017 so that they no longer automatically strip \r characters on binary
mounts. This affects the OCaml build system in a few places, requiring
the addition of a few tr calls.

References:
  * https://cygwin.com/ml/cygwin/2017-02/msg00152.html
  * https://cygwin.com/ml/cygwin/2017-02/msg00189.html
  * https://cygwin.com/ml/cygwin/2017-02/msg00188.html

Use the same C compiler, CC, in all the build system.

and make the Uchar independent from the Format and Printf
modules. Previously this made it impossible to use the type in the
natural habitat that the String, Bytes and Buffer modules could be.

To break the circular dependency between Bigarray and Unix, a CamlinternalBigarray module was added to the stdlib. This module defines all the types used by the compiler to produce optimized code for bigarrays.

Thanks to David Allsopp for fixing Windows tests.