cc-wrapper: rename $needsTarget -> $targetPassed

in preparation for next commit

pkgs/build-support/cc-wrapper/add-clang-cc-cflags-before.sh

@@ -1,4 +1,4 @@
-needsTarget=true
+targetPassed=false
 targetValue=""
 
 declare -i n=0
@@ -14,22 +14,22 @@ while (("$n" < "$nParams")); do
             echo "Error: -target requires an argument" >&2
             exit 1
         fi
-        needsTarget=false
+        targetPassed=true
         targetValue=$v
         # skip parsing the value of -target
         n+=1
         ;;
     --target=*)
-        needsTarget=false
+        targetPassed=true
         targetValue="${p#*=}"
         ;;
     esac
 done
 
-if ! $needsTarget && [[ "$targetValue" != "@defaultTarget@" ]]; then
+if $targetPassed && [[ "$targetValue" != "@defaultTarget@" ]]; then
     echo "Warning: supplying the --target $targetValue != @defaultTarget@ argument to a nix-wrapped compiler may not work correctly - cc-wrapper is currently not designed with multi-target compilers in mind. You may want to use an un-wrapped compiler instead." >&2
 fi
 
-if $needsTarget && [[ $0 != *cpp ]]; then
+if ! $targetPassed && [[ $0 != *cpp ]]; then
     extraBefore+=(-target @defaultTarget@ @machineFlags@)
 fi