Remove SKIP from t/10_opengl_array.t

The recent item_count fix by Olaf Dabrunz has apparently
fixed the underlying problem leading to segfaults.
Remove the working tests from the TODO block

NOTE: when I did this, now all tests pass but if I remove
the remaining TODO blocks then the tests fail again.  I
think there may be one more offset or count bug in there.
Add another test to the TODO block

This code has an additional FAIL subtest immediately after
the previous subtest 83.  Smells like something is still
off.
die when trying to push past allocated rpn stack size
increase rpn stack size for =, < and > by one to prevent invalid writes
updated glext.h to include extensions up to OpenGL 4.2 and used it to generate and update further ancillary files
prepared an xs file for addition of functions needed for gltut
added bindings for glGenVertexArrays and glBindVertexArray
updated freeglut to 2.8.0
added glAttachShader, glDeleteShader, glGetShaderiv_p, glGetShaderInfoLog_p
added glutInitContextVersion, glutInitContextFlags, glutInitContextProfile, GLUT_CORE_PROFILE, GLUT_DEBUG
get program iv
added occlusion query capability
added glDrawElementsBaseVertex_c
add GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER, GL_FRAMEBUFFER_COMPLETE