gen-casefold-txt.pl and gen-casemap-txt.pl are licensed under GPLv2+, so
they are not touched by this commit.

A lot of *.c files in tests/ don't have a license header.

https://bugzilla.gnome.org/show_bug.cgi?id=776504

In Windows development environments that have it, <unistd.h> is mostly
just a wrapper around several other native headers (in particular,
<io.h>, which contains read(), close(), etc, and <process.h>, which
contains getpid()). But given that some Windows dev environments don't
have <unistd.h>, everything that uses those functions on Windows
already needed to include the correct Windows header as well, and so
there is never any point to including <unistd.h> on Windows.

Also, remove some <unistd.h> includes (and a few others) that were
unnecessary even on unix.

https://bugzilla.gnome.org/show_bug.cgi?id=710519

https://bugzilla.gnome.org/show_bug.cgi?id=711047

Sat Mar 13 23:18:45 2004  Owen Taylor  <otaylor@redhat.com>

        * tests/env-test.c (main): Remove critical log handler;
        we can't trigger g_return_if_fails() in our test suite
        even silently, because the user could have compiled
        with --disable-debug. #if 0 the tests for
        g_setenv/g_unsetenv with a "foo=bar" variable name.
        (#136709, reported by Frédéric L. W. Meunier)

2003-02-26 Hans Breuer  <hans@breuer.org>

	* glib/glib.def : added g_hash_table_find and a
	bunch of g_queue_*

	* glib/gmain.c : make it compile on win32,
	child_wake_up_pipe replaced by semaphore like it is done
	for the other wake_up_pipe

	* config.h.win32.in : added HAVE_INT64_AND_I64
	* glibconfig.h.win32.in : G_MAXSIZE .. G_M??INT64,
	and typedef for GPid

	* test/env-test.c : don't let the local log function
	collide in namespace with standard C

2003-08-08  Matthias Clasen  <maclas@gmx.de>

	* tests/env-test.c (main): Remove a test for getenv() behaviour which isn't specified by SUS
	and doesn't work on Solaris.

2003-08-07  Matthias Clasen  <maclas@gmx.de>

	* tests/env-test.c: Add tests for '=' in names and values.

	* glib/gutils.c (g_setenv, g_unsetenv): Check that the variable name doesn't contain '='. Add a
	declaration for environ.  (#119338)