meson: support structuredAttrs in setup hook

Tested emilua with and without __structuredAttrs.

pkgs/by-name/me/meson/setup-hook.sh

@@ -50,7 +50,8 @@ mesonConfigurePhase() {
 mesonCheckPhase() {
     runHook preCheck
 
-    local flagsArray=($mesonCheckFlags "${mesonCheckFlagsArray[@]}")
+    local flagsArray=()
+    concatTo flagsArray mesonCheckFlags mesonCheckFlagsArray
 
     echoCmd 'mesonCheckPhase flags' "${flagsArray[@]}"
     meson test --no-rebuild --print-errorlogs "${flagsArray[@]}"
@@ -64,12 +65,9 @@ mesonInstallPhase() {
     local flagsArray=()
 
     if [[ -n "$mesonInstallTags" ]]; then
-        flagsArray+=("--tags" "${mesonInstallTags// /,}")
+        flagsArray+=("--tags" "$(concatStringsSep "," mesonInstallTags)")
     fi
-    flagsArray+=(
-        $mesonInstallFlags
-        "${mesonInstallFlagsArray[@]}"
-    )
+    concatTo flagsArray mesonInstallFlags mesonInstallFlagsArray
 
     echoCmd 'mesonInstallPhase flags' "${flagsArray[@]}"
     meson install --no-rebuild "${flagsArray[@]}"