[hipcc] Remove extra definition of hipBinUtilPtr_ in derived platforms

Fixes UB when hipBinUtilPtr_ is used.

Fixes #182

Submitting on behalf of GitHub user @LunNova

Author: searlmc1

amd/hipcc/src/hipBin_amd.h

@@ -42,7 +42,6 @@ THE SOFTWARE.
 
 class HipBinAmd : public HipBinBase {
  private:
-  HipBinUtil* hipBinUtilPtr_;
   string hipClangPath_ = "";
   string roccmPathEnv_, hipRocclrPathEnv_, hsaPathEnv_;
   PlatformInfo platformInfoAMD_;

amd/hipcc/src/hipBin_nvidia.h

@@ -31,7 +31,6 @@ THE SOFTWARE.
 
 class HipBinNvidia : public HipBinBase {
  private:
-  HipBinUtil* hipBinUtilPtr_;
   string cudaPath_ = "";
   PlatformInfo platformInfoNV_;
   string hipCFlags_, hipCXXFlags_, hipLdFlags_;