SWDEV-387063 - Use clang default for C++ version

Instead of enforcing c++14 here, we can instead use the current
clang default

Change-Id: Ib0a178a53c1377f2910edf6fab82b2bac6567ac7


[ROCm/clr commit: 33e48b9629]

projects/clr/hipamd/src/hiprtc/hiprtcInternal.cpp

@@ -184,7 +184,6 @@ RTCCompileProgram::RTCCompileProgram(std::string name_) : RTCProgram(name_), fgp
   compile_options_.push_back(hipVerMajor);
   compile_options_.push_back(hipVerMinor);
   compile_options_.push_back(hipVerPatch);
-  compile_options_.push_back("-std=c++14");
   compile_options_.push_back("-Wno-gnu-line-marker");
   compile_options_.push_back("-Wno-missing-prototypes");
 #ifdef _WIN32