Fix clang-offload-bundler error

Fix "clang-offload-bundler: error: Can't find bundle for the host
target" because hard coded `--target=x86_64-linux-gnu` option clashed
with `--target` option propagated via `.hipInfo`.

src/hipBin_spirv.h

@@ -699,7 +699,7 @@ void HipBinSpirv::executeHipCCCmd(vector<string> origArgv) {
   opts.needCXXFLAGS.present = opts.compile.present;
   if (opts.needCXXFLAGS.present && !opts.needCFLAGS.present) {
     CMD += " " + HIPCXXFLAGS;
-    CMD += " -x hip --target=x86_64-linux-gnu";
+    CMD += " -x hip";
   }
 
   opts.needLDFLAGS.present =