Added MAX_TEXTURE_UNITS in getInteger method of libGL

Change-Id: I0c0d5432a2f83153c61db4e7f80b5ba059fa2758
Reviewed-on: https://swiftshader-review.googlesource.com/3725
Reviewed-by: Maxime Grégoire <mgregoire@google.com>
Tested-by: Maxime Grégoire <mgregoire@google.com>

src/OpenGL/libGL/Context.cpp

diff --git a/src/OpenGL/libGL/Context.cpp b/src/OpenGL/libGL/Context.cpp
index c23420e..20edad7 100644
--- a/src/OpenGL/libGL/Context.cpp
+++ b/src/OpenGL/libGL/Context.cpp
@@ -1353,6 +1353,7 @@
     // Context::getFloatv.

     switch (pname)

     {

+    case GL_MAX_TEXTURE_UNITS:                *params = MAX_TEXTURE_IMAGE_UNITS;          break;

     case GL_MAX_VERTEX_ATTRIBS:               *params = MAX_VERTEX_ATTRIBS;               break;

     case GL_MAX_VERTEX_UNIFORM_VECTORS:       *params = MAX_VERTEX_UNIFORM_VECTORS;       break;

     case GL_MAX_VERTEX_UNIFORM_COMPONENTS:    *params = MAX_VERTEX_UNIFORM_VECTORS * 4;   break;   // FIXME: Verify