Use slices for AUR dep resolving

This ensures AUR packages are always installed in the order specified by
the user. In the case there are any inner conflicts packages will be
removed in a predictable way.

depSolver.go

@@ -69,7 +69,7 @@ func (ds *depSolver) resolveTargets(pkgs []string) error {
 	// RPC requests are slow
 	// Combine as many AUR package requests as possible into a single RPC
 	// call
-	aurTargets := make(stringSet)
+	aurTargets := make([]string, 0)
 	pkgs = removeInvalidTargets(pkgs)
 
 	for _, pkg := range pkgs {
@@ -91,7 +91,7 @@ func (ds *depSolver) resolveTargets(pkgs []string) error {
 		// aur/ prefix means we only check the aur
 		if target.Db == "aur" || mode == ModeAUR {
 			ds.Targets = append(ds.Targets, target)
-			aurTargets.set(target.DepString())
+			aurTargets = append(aurTargets, target.DepString())
 			continue
 		}
 
@@ -133,7 +133,7 @@ func (ds *depSolver) resolveTargets(pkgs []string) error {
 
 		//if there was no db prefix check the aur
 		if target.Db == "" {
-			aurTargets.set(target.DepString())
+			aurTargets = append(aurTargets, target.DepString())
 		}
 
 		ds.Targets = append(ds.Targets, target)
@@ -292,8 +292,8 @@ func (ds *depSolver) findSatisfierAurCache(dep string) *rpc.Pkg {
 	return nil
 }
 
-func (ds *depSolver) cacheAURPackages(_pkgs stringSet) error {
-	pkgs := _pkgs.copy()
+func (ds *depSolver) cacheAURPackages(_pkgs []string) error {
+	pkgs := sliceToStringSet(_pkgs)
 	query := make([]string, 0)
 
 	for pkg := range pkgs {
@@ -392,9 +392,9 @@ func (ds *depSolver) findProvides(pkgs stringSet) error {
 	return nil
 }
 
-func (ds *depSolver) resolveAURPackages(pkgs stringSet, explicit bool) error {
+func (ds *depSolver) resolveAURPackages(pkgs []string, explicit bool) error {
 	newPackages := make(stringSet)
-	newAURPackages := make(stringSet)
+	newAURPackages := make([]string, 0)
 	toAdd := make([]*rpc.Pkg, 0)
 
 	if len(pkgs) == 0 {
@@ -406,7 +406,7 @@ func (ds *depSolver) resolveAURPackages(pkgs stringSet, explicit bool) error {
 		return err
 	}
 
-	for name := range pkgs {
+	for _, name := range pkgs {
 		if ds.Seen.get(name) {
 			continue
 		}
@@ -451,7 +451,7 @@ func (ds *depSolver) resolveAURPackages(pkgs stringSet, explicit bool) error {
 
 		//assume it's in the aur
 		//ditch the versioning because the RPC can't handle it
-		newAURPackages.set(dep)
+		newAURPackages = append(newAURPackages, dep)
 
 	}