Add run-time license.

Author: ArnaudCharlet

COPYING.RUNTIME

@@ -0,0 +1,53 @@
+GCC RUNTIME LIBRARY EXCEPTION
+
+Version 3.1, 31 March 2009
+
+Copyright (c) 2009 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
+
+This GCC Runtime Library Exception ("Exception") is an additional permission under section 7 of the GNU General Public License,
+version 3 ("GPLv3"). It applies to a given file (the "Runtime Library") that bears a notice placed by the copyright holder of
+the file stating that the file is governed by GPLv3 along with this Exception.
+
+When you use GCC to compile a program, GCC may combine portions of certain GCC header files and runtime libraries with the
+compiled program. The purpose of this Exception is to allow compilation of non-GPL (including proprietary) programs to
+use, in this way, the header files and runtime libraries covered by this Exception.
+
+0. Definitions.
+
+A file is an "Independent Module" if it either requires the Runtime Library for execution after a Compilation
+Process, or makes use of an interface provided by the Runtime Library, but is not otherwise based on the Runtime Library.
+
+"GCC" means a version of the GNU Compiler Collection, with or without modifications, governed by version 3
+(or a specified later version) of the GNU General Public License (GPL) with the option of using any subsequent
+versions published by the FSF.
+
+"GPL-compatible Software" is software whose conditions of propagation, modification and use would permit combination
+with GCC in accord with the license of GCC.
+
+"Target Code" refers to output from any compiler for a real or virtual target processor architecture, in executable
+form or suitable for input to an assembler, loader, linker and/or execution phase. Notwithstanding that, Target Code
+does not include data in any format that is used as a compiler intermediate representation, or used for producing a
+compiler intermediate representation.
+
+The "Compilation Process" transforms code entirely represented in non-intermediate languages designed for human-written
+code, and/or in Java Virtual Machine byte code, into Target Code. Thus, for example, use of source code generators and
+preprocessors need not be considered part of the Compilation Process, since the Compilation Process can be understood as
+starting with the output of the generators or preprocessors.
+
+A Compilation Process is "Eligible" if it is done using GCC, alone or with other GPL-compatible software, or if it is
+done without using any work based on GCC. For example, using non-GPL-compatible Software to optimize any GCC
+intermediate representations would not qualify as an Eligible Compilation Process.
+
+1. Grant of Additional Permission.
+
+You have permission to propagate a work of Target Code formed by combining the Runtime Library with Independent Modules,
+even if such propagation would otherwise violate the terms of GPLv3, provided that all Target Code was generated by
+Eligible Compilation Processes. You may then convey such a combination under terms of your choice, consistent with the
+licensing of the Independent Modules.
+
+2. No Weakening of GCC Copyleft.
+
+The availability of this Exception does not imply any general presumption that third-party software is unaffected by
+the copyleft requirements of the license of GCC.