[hipcc] Remove the previous workaround.

Change-Id: Ie1c2aa21689bc343c10fd4b699546cf500ced5b2

bin/hipcc

@@ -470,13 +470,6 @@ foreach $arg (@ARGV)
         $optArg = $arg;
     }
 
-    ## This is a temporary workaround for CMake detection of OpenMP support.
-    ## It should be removed when the OpenMP detection c++ test in CMake is updated
-    ## and corrected CMake version is available.
-    if((defined $HIP_COMPILER) and ($HIP_COMPILER eq "clang") and ($arg eq '-fopenmp')) {
-        $HIPCXXFLAGS .= " -D_OPENMP "
-    }
-
     ## process linker response file for hip-clang
     ## extract object files from static library and pass them directly to
     ## hip-clang in command line.