sort world dependencies alphabetically

this makes 'lbu diff' and aaudit diffs nice when a world
dependency is added or removed. sorting also makes the ordering
more deterministic as the world targets constraints are always
applied in the same order. test suite updated accordingly.

src/solver.c

@@ -897,6 +897,12 @@ static int free_package(apk_hash_item item, void *ctx)
 	return 0;
 }
 
+static int cmp_pkgname(const void *p1, const void *p2)
+{
+	const struct apk_dependency *d1 = p1, *d2 = p2;
+	return strcmp(d1->name->name, d2->name->name);
+}
+
 int apk_solver_solve(struct apk_database *db,
 		     unsigned short solver_flags,
 		     struct apk_dependency_array *world,
@@ -907,6 +913,8 @@ int apk_solver_solve(struct apk_database *db,
 	struct apk_solver_state ss_data, *ss = &ss_data;
 	struct apk_dependency *d;
 
+	qsort(world->item, world->num, sizeof(world->item[0]), cmp_pkgname);
+
 restart:
 	memset(ss, 0, sizeof(*ss));
 	ss->db = db;

test/installif1.test

@@ -2,8 +2,8 @@
 --test-repo installif1.repo
 add foo app
 @EXPECT
-(1/4) Installing foo (1)
-(2/4) Installing lib (1)
-(3/4) Installing app (1)
+(1/4) Installing lib (1)
+(2/4) Installing app (1)
+(3/4) Installing foo (1)
 (4/4) Installing appiif1 (1)
 OK: 0 MiB in 0 packages

test/installif2.test

@@ -2,10 +2,10 @@
 --test-repo installif1.repo
 add foo app bar
 @EXPECT
-(1/6) Installing foo (1)
-(2/6) Installing lib (1)
-(3/6) Installing app (1)
-(4/6) Installing appiif1 (1)
-(5/6) Installing bar (1)
-(6/6) Installing appiif2 (1)
+(1/6) Installing lib (1)
+(2/6) Installing app (1)
+(3/6) Installing bar (1)
+(4/6) Installing appiif2 (1)
+(5/6) Installing foo (1)
+(6/6) Installing appiif1 (1)
 OK: 0 MiB in 0 packages

test/installif3.test

@@ -3,8 +3,8 @@
 --test-repo installif2.repo
 add foo app
 @EXPECT
-(1/4) Installing foo (1)
-(2/4) Installing lib (1)
-(3/4) Installing app (1)
+(1/4) Installing lib (1)
+(2/4) Installing app (1)
+(3/4) Installing foo (1)
 (4/4) Installing appiif1 (1)
 OK: 0 MiB in 0 packages

test/provides4.test

@@ -2,6 +2,6 @@
 --test-repo provides.repo
 add mymailreader mailreadplus
 @EXPECT
-(1/2) Installing mymailreader (1)
-(2/2) Installing mailreadplus (1)
+(1/2) Installing mailreadplus (1)
+(2/2) Installing mymailreader (1)
 OK: 0 MiB in 0 packages