Externals: add summary of licenses

Externals/licenses.md

@@ -0,0 +1,70 @@
+Dolphin includes or links code of the following third-party software projects:
+
+- [ALSA](http://www.alsa-project.org/):
+   [LGPLv2.1+](http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=COPYING)
+- [BlueZ](http://www.bluez.org/):
+   [LGPLv2.1+](https://git.kernel.org/cgit/bluetooth/bluez.git/tree/COPYING.LIB)
+- [Bochs](http://bochs.sourceforge.net/):
+   [LGPLv2.1+](http://bochs.sourceforge.net/cgi-bin/lxr/source/COPYING)
+- [ENet](http://enet.bespin.org/):
+   [MIT](http://enet.bespin.org/License.html)
+- [GCEmu](http://sourceforge.net/projects/gcemu-project/):
+   GPLv2+
+- [gettext](https://www.gnu.org/software/gettext/):
+   [GPLv3+](http://git.savannah.gnu.org/cgit/gettext.git/tree/COPYING)
+- [googletest](https://code.google.com/p/googletest/):
+   [3-clause BSD](https://code.google.com/p/googletest/source/browse/trunk/LICENSE)
+- [libao](https://www.xiph.org/ao/):
+   [GPLv2+](https://trac.xiph.org/browser/trunk/ao/README)
+- [libav](https://libav.org/):
+   [GPLv2+](https://libav.org/legal.html)
+- [libcdio](https://www.gnu.org/software/libcdio/):
+   [GPLv3+](http://git.savannah.gnu.org/gitweb/?p=libcdio.git;a=blob_plain;f=COPYING)
+- [libiconv](https://www.gnu.org/software/libiconv/):
+   [LGPLv2+](http://git.savannah.gnu.org/cgit/libiconv.git/tree/COPYING.LIB)
+- [libpng](http://www.libpng.org/pub/png/libpng.html):
+   [libpng license](http://www.libpng.org/pub/png/src/libpng-LICENSE.txt)
+- [libusb](http://libusb.info/):
+   [LGPLv2.1+](https://github.com/libusb/libusb/blob/master/COPYING)
+- [LLVM](http://llvm.org/):
+   [University of Illinois/NCSA Open Source license](http://llvm.org/docs/DeveloperPolicy.html#license)
+- [LZO](http://www.oberhumer.com/opensource/lzo/):
+   [GPLv2+](http://www.oberhumer.com/opensource/gpl.html)
+- [MiniUPnPc](http://miniupnp.free.fr/):
+   [3-clause BSD](https://github.com/miniupnp/miniupnp/blob/master/miniupnpc/LICENSE)
+- [Microsoft Visual C++ Runtime Library](http://www.microsoft.com/en-us/download/details.aspx?id=40784):
+   [System Library if not distributed](https://www.gnu.org/licenses/gpl-faq.html#WindowsRuntimeAndGPL)
+- [OpenAL Soft](http://kcat.strangesoft.net/openal.html):
+   [LGPLv2+](http://repo.or.cz/w/openal-soft.git/blob/HEAD:/COPYING)
+- [OpenGL Header (MESA)](http://mesa3d.org/):
+   [MIT](http://cgit.freedesktop.org/mesa/mesa/tree/include/GL/gl.h)
+- [OpenGL Extension Header (Khronos)](https://www.opengl.org/registry/#headers):
+   [MIT](https://www.opengl.org/registry/api/GL/glext.h)
+- [PearPC](http://pearpc.sourceforge.net/):
+   [GPLv2](http://pearpc.cvs.sourceforge.net/viewvc/pearpc/pearpc/COPYING?view=markup) (with permission by the author to license under GPLv2+)
+- [PolarSSL](https://polarssl.org/):
+   [GPLv2+](https://github.com/polarssl/polarssl/blob/development/LICENSE)
+- [PortAudio](http://www.portaudio.com/):
+   [MIT](http://www.portaudio.com/license.html)
+- [PulseAudio](http://www.freedesktop.org/wiki/Software/PulseAudio/):
+   [LGPLv2.1+](http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/LICENSE)
+- [Qt5](http://qt-project.org/):
+   [LGPLv3 and other licenses](http://doc.qt.io/qt-5/licensing.html)
+- [SDL](https://www.libsdl.org/):
+   [zlib license](http://hg.libsdl.org/SDL/file/tip/COPYING.txt)
+- [SFML](http://www.sfml-dev.org/):
+   [zlib license](http://www.sfml-dev.org/license.php)
+- [SOIL](http://www.lonesock.net/soil.html):
+   [public domain](http://www.lonesock.net/soil.html)
+- [SoundTouch](http://www.surina.net/soundtouch/):
+   [LGPLv2+](http://www.surina.net/soundtouch/license.html)
+- [TAP-Windows](https://openvpn.net/):
+   header only
+- [wxWidgets](https://www.wxwidgets.org/):
+   [wxWindows Library License](https://www.wxwidgets.org/about/licence/) (LGPLv2+-like)
+- [XAudio2](http://msdn.microsoft.com/en-us/library/windows/desktop/hh405049.aspx):
+   headers only
+- [xxHash](https://github.com/Cyan4973/xxHash):
+   [2-clause BSD](https://github.com/Cyan4973/xxHash/blob/master/LICENSE)
+- [zlib](http://www.zlib.net/):
+   [zlib license](http://www.zlib.net/zlib_license.html)