hcc-config already sets -lc++ -lc++abi flags

Since hcc-config will set the flags for CentOS7 and RHEL 7.X, we don't need to set flags here.

bin/hipcc

@@ -131,12 +131,6 @@ if ($HIP_PLATFORM eq "hcc") {
         $HIPCXXFLAGS .= " -stdlib=libc++";
         $setStdLib = 1;
     }
-    # Force -stdlib=libc++ on Cent OS 7 and RHEL 7.4
-    if (($HOST_OSNAME eq "\"centos\"" and $HOST_OSVER eq "\"7\"") or ($HOST_OSNAME eq "\"rhel\"" and $HOST_OSVER eq "\"7.4\"")) {
-        $HIPCXXFLAGS .= " -stdlib=libc++";
-        $HIPLDFLAGS .= " -lc++ -lc++abi";
-        $setStdLib = 1;
-    }
 
     $HIPCXXFLAGS .= " -I$HIP_PATH/include/hip/hcc_detail/cuda";
     $HIPCXXFLAGS .= " -I$HSA_PATH/include";