Fixed some missing static libraries for the EGL dummy vendor library.
Added Xlib to the GLX dummy library.
Added the --no-undefined flag for both of the dummy vendor libraries.
Added three new configure options to disable building the EGL, GLX, GLES
libraries.
In the tests makefile, move the list of test scripts to separate unconditional
variables, and add those to EXTRA_DIST. Just conditionally adding variables to
TESTS isn't enough to include the test scripts in the dist package.
Split up the TESTS and check_PROGRAMS variable assignments, so that they're
assigned next to the commands to build each test.
In addition to better readability and making it easier to avoid merge
conflicts, this will allow making some of the tests conditional based on build
options.
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.
