Add HIP_IGNORE_HCC_VERSION.

Ignores strict checking of HCC and HIP version.
Can be useful when developing new HCC code.

bin/hipcc

@@ -374,7 +374,8 @@ if ($printHipVersion) {
 }
 if ($runCmd) {
     if ($HIP_PLATFORM eq "hcc" and exists($hipConfig{'HCC_VERSION'}) and $HCC_VERSION ne $hipConfig{'HCC_VERSION'}) {
-        print ("HIP ($HIP_PATH) was built using hcc $hipConfig{'HCC_VERSION'}, but you are using $HCC_HOME/hcc with version $HCC_VERSION from hipcc. Please rebuild HIP including cmake or update HCC_HOME variable.\n") && die ();
+        print ("HIP ($HIP_PATH) was built using hcc $hipConfig{'HCC_VERSION'}, but you are using $HCC_HOME/hcc with version $HCC_VERSION from hipcc. Please rebuild HIP including cmake or update HCC_HOME variable.\n") ;
+        die unless $ENV{'HIP_IGNORE_HCC_VERSION'};
     }
     system ("$CMD") and die ();
 }