Gracefully handle no unicode in printf

tcshrc.prompt.final

@@ -280,10 +280,15 @@ if( 0 == ${__res} ) then
         #set git_prompt="%{${csi}${branch_indent}C${csi}mBranch: ${csi}3;38;2;255;192;192m${git_branch}${csi}m${csi}${branch_space}C\n%}"
 
 
-        # If the font doesn't support the special branch symbol... 
-        set branch_symbol=`printf "\uE0A0"`
-        # I could always fallback to this one... (keep padded spaces... for alignment)
-        set branch_symbol=`printf '\u2387\ \ '`
+		if( ! $?CSHENV_NO_UNICODE_PRINTF ) then
+			# If the font doesn't support the special branch symbol... 
+			set branch_symbol=`printf "\uE0A0"`
+			# I could always fallback to this one... (keep padded spaces... for alignment)
+			set branch_symbol=`printf '\u2387\ \ '`
+		else
+			# Non unicode fallback 'X'
+			set branch_symbol='X'
+		endif
         git rev-list --count --left-right \@\{upstream\}..HEAD>&/dev/null
         set __res=$?
         #echo "Got: ${git_counts}"