Update standard flags to C++17 to allow for inline static members in

DPC++ backend clases.

scripts/build/shellTools.sh

@@ -263,13 +263,13 @@ function compilerCpp11Flags {
 
     case "$vendor" in
         GCC|LLVM|INTEL|PGI|POWERPC)
-            echo "-std=c++11";;
-        CRAY)      echo "-hstd=c++11"          ;;
+            echo "-std=c++17";;
+        CRAY)      echo "-hstd=c++17"          ;;
         IBM)       echo "-qlanglvl=extended0x" ;;
         # Unknown
-        PATHSCALE) echo "-std=c++11"           ;;
+        PATHSCALE) echo "-std=c++17"           ;;
         # Unknown
-        HP)        echo "-std=c++11"           ;;
+        HP)        echo "-std=c++17"           ;;
         *) ;;
     esac
 }