Use -O0 alongside -ggdb3 to address compiler warning

Running the documentation generation workflow I encountered the following
compilation warnings:

```
icpx: warning: Note that use of '-ggdb3' without any optimization-level \
     option will turn off most compiler optimizations similar to use of \
     '-O0' [-Wdebug-disables-optimization]
```

This change addressed the warning.

Author: oleksandr-pavlyk

libsyclinterface/CMakeLists.txt

@@ -114,10 +114,10 @@ if(WIN32)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_FLAGS}")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNING_FLAGS}")
     set(CMAKE_C_FLAGS_DEBUG
-        "${CMAKE_C_FLAGS_DEBUG} ${WARNING_FLAGS} -ggdb3 -DDEBUG"
+        "${CMAKE_C_FLAGS_DEBUG} ${WARNING_FLAGS} -O0 -ggdb3 -DDEBUG"
     )
     set(CMAKE_CXX_FLAGS_DEBUG
-        "${CMAKE_CXX_FLAGS_DEBUG} ${WARNING_FLAGS} -ggdb3 -DDEBUG"
+        "${CMAKE_CXX_FLAGS_DEBUG} ${WARNING_FLAGS} -O0 -ggdb3 -DDEBUG"
     )
 elseif(UNIX)
     string(CONCAT WARNING_FLAGS
@@ -152,10 +152,10 @@ elseif(UNIX)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CFLAGS}")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXXFLAGS}")
     set(CMAKE_C_FLAGS_DEBUG
-        "${CMAKE_C_FLAGS_DEBUG} ${CFLAGS} -ggdb3 -DDEBUG"
+        "${CMAKE_C_FLAGS_DEBUG} ${CFLAGS} -O0 -ggdb3 -DDEBUG"
     )
     set(CMAKE_CXX_FLAGS_DEBUG
-        "${CMAKE_CXX_FLAGS_DEBUG} ${CXXFLAGS} -ggdb3 -DDEBUG"
+        "${CMAKE_CXX_FLAGS_DEBUG} ${CXXFLAGS} -O0 -ggdb3 -DDEBUG"
     )
 else()
     message(FATAL_ERROR "Unsupported system.")