SWDEV-132637: Remove OpenCL cl_khr_depth_images workaround that is not needed anymore

The cl_khr_depth_images associated macro definition is defined twice in
the compiler: in opencl-c.h and automatically by the compiler deduced
from the cl-ext list. These two co-exist and there is no need to remove
cl_khr_depth_images from the cl-ext list.

If we remove cl_khr_depth_images from the cl-ext list, and we do not
include opencl-c.h the macro is not defined.

This fixes conformance test ./test_compiler compiler_defines_for_extensions
when using Comgr with -include opencl-c-base.h -fdeclare-opencl-builtins
without including opencl-c.h.

Before we got the error `ERROR: Supported extension cl_khr_depth_images
not defined in kernel`

This change is needed to eventually get rid of the opencl-c.pch that is embedded in comgr, and that makes implementing a compilation cache in comgr hard.

Change-Id: I76497874ebe7163966420d4ac23a0788b93a36fd

rocclr/device/devprogram.cpp

@@ -1964,13 +1964,6 @@ std::vector<std::string> Program::ProcessOptions(amd::option::Options* options)
     std::vector<std::string> extensions(sit, end);
 
     if (isLC()) {
-      // FIXME_lmoriche: opencl-c.h defines 'cl_khr_depth_images', so
-      // remove it from the command line. Should we fix opencl-c.h?
-      auto found = std::find(extensions.begin(), extensions.end(), "cl_khr_depth_images");
-      if (found != extensions.end()) {
-        extensions.erase(found);
-      }
-
       if (!extensions.empty()) {
         std::ostringstream clext;