SWDEV-278810 - Remove default addition of CXX Flags if file type is not recognized

Change-Id: I2b29f246d138b511d77f8e78f273795b4977313f


[ROCm/clr commit: 8e9e8f40e4]

projects/clr/hipamd/bin/hipcc

@@ -563,8 +563,6 @@ foreach $arg (@ARGV)
             $needCFLAGS = 1;
         } elsif ($hasCXX) {
             $needCXXFLAGS = 1;
-        } else {
-            $needCXXFLAGS = 1;
         }
         push (@inputs, $arg);
         #print "I: <$arg>\n";