Revert "Compiler - set CXX Compiler if not set (#466)" (#467)

This reverts commit 2eb3bd30ef.

[ROCm/rocdecode commit: 4f10c3893b]

projects/rocdecode/samples/videoDecodeBatch/CMakeLists.txt

@@ -36,10 +36,7 @@ endif()
 
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/../../cmake)
 list(APPEND CMAKE_PREFIX_PATH ${ROCM_PATH}/hip ${ROCM_PATH})
-# Set AMD Clang as default compiler
-if (NOT DEFINED CMAKE_CXX_COMPILER)
-  set(CMAKE_CXX_COMPILER ${ROCM_PATH}/bin/amdclang++)
-endif()
+set(CMAKE_CXX_COMPILER ${ROCM_PATH}/bin/amdclang++)
 
 # rocDecode sample build type
 set(DEFAULT_BUILD_TYPE "Release")