LICENSE: change license to MIT

In the spirit of 70df7aaa lets change the license again, this time to
MIT!

Context:

	On 23:15 Tue 10 Apr 2012, Lennart Poettering wrote:
	> On Mon, 09.04.12 14:51, Brandon Philips (brandon@ifup.org) wrote:
	> > I am working on a daemon and it would be great to use libdaemon.
	> > However, the project is Apache licensed and I have no idea how they
	> > interact. Is it at all possible to dual license LGPL/BSD or LGPL/Apache?
	> >
	> > https://github.com/racker/virgo
	>
	> heya. I am not such a big fan of the BSD licenses myself, but I guess in
	> this case it is OK.

	Yea :-/

	> The only major other contributor seems to be Diego Pettenò who should be
	> OK with such a change. I'll ask him.

	Great, thank you.

	> Would you be OK with MIT as well?

	Yes, the MIT license works too.
diff --git a/libdaemon/dexec.h b/libdaemon/dexec.h
index 9b34240..7c03017 100644
--- a/libdaemon/dexec.h
+++ b/libdaemon/dexec.h
@@ -6,19 +6,24 @@
 
   Copyright 2003-2008 Lennart Poettering
 
-  libdaemon is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License as
-  published by the Free Software Foundation, either version 2.1 of the
-  License, or (at your option) any later version.
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
 
-  libdaemon is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  Lesser General Public License for more details.
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
 
-  You should have received a copy of the GNU Lesser General Public
-  License along with libdaemon. If not, see
-  <http://www.gnu.org/licenses/>.
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+
 ***/
 
 #include <stdarg.h>