Fixed crash if initialization of EGL failed but was tried again later.

The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly
uninitialized data structure if loading the library first failed. A later try to
use EGL then skipped initialization and assumed it was previously successful
because the data structure now already existed. This led to at least one crash
in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was
dereferenced to make a call to eglBindAPI().

INSTALL.txt

@@ -0,0 +1,40 @@
+
+To compile and install SDL:
+
+    1.  Windows with Visual Studio:
+        * Read VisualC.html
+
+        Windows with gcc, either native or cross-compiling:
+        * Read the FAQ at http://wiki.libsdl.org/moin.fcg/FAQWindows
+        * Run './configure; make; make install'
+
+        Mac OS X with Xcode:
+        * Read docs/README-macosx.md
+
+        Mac OS X from the command line:
+        * Run './configure; make; make install'
+
+        Linux and other UNIX systems:
+        * Run './configure; make; make install'
+
+        Android:
+        * Read docs/README-android.md
+
+        iOS:
+        * Read docs/README-ios.md
+
+        Using Cmake:
+        * Read docs/README-cmake.md
+
+    2.  Look at the example programs in ./test, and check out the online
+        documentation at http://wiki.libsdl.org/
+
+    3.  Join the SDL developer mailing list by sending E-mail to
+    	sdl-request@libsdl.org
+        and put "subscribe" in the subject of the message.
+
+        Or alternatively you can use the web interface:
+            http://www.libsdl.org/mailing-list.php
+
+That's it!
+Sam Lantinga <slouken@libsdl.org>