Added a test for EGL_EXT_device_enumeration and EGL_EXT_platform_device, plus
dispatching to an EGL extesnion function based on an EGLDeviceEXT handle.
Added a test for eglGetProcAddress and dispatching for EGL and GL functions.
Added three EGL extension functions to the EGL dummy vendor, to test
dispatching extensions by display, device, and current context.
Added a simple implementation of eglCreateContext, eglDestroyContext, and
eglMakeCurrent, and glGetString.
Added two dummy libraries for EGL. They both use the same code, but each one
has a name string that can be used to check which vendor something is
dispatched to.
The dummy library is still incomplete, but more functions will be add later
along with more tests.
The test just creates an EGLDisplay using a dummy platform type, and then
checks to make sure that the display dispatches to the correct vendor library.
Also added a script to set up the test environment, and a file for common
functions and variables for EGL tests.
Change the assembly template arrays for ARMv7 to use arrays of 16-bit integers
instead of 8-bit.
This removes the need to byte swap them on little-endian systems.
Add a new unit test, testpatchentrypoints_gldispatch. It calls into
libGLdispatch directly instead of going through GLX or EGL, and it tests
patching and unpatching between multiple vendor libraries.
Rewrote the x86-64 assembly for the entrypoint patching tests. It now uses
absolute memory addresses instead of RIP-relative, so it can work even if the
variable that it's supposed to update isn't within +-2GB of the function.
