Refer to https URLs when applicable

src/gfx/pal_packing.cpp

@@ -25,7 +25,7 @@ using std::swap;
 
 namespace packing {
 
-// The solvers here are picked from the paper at http://arxiv.org/abs/1605.00558:
+// The solvers here are picked from the paper at https://arxiv.org/abs/1605.00558:
 // "Algorithms for the Pagination Problem, a Bin Packing with Overlapping Items"
 // Their formulation of the problem consists in packing "tiles" into "pages"; here is a
 // correspondence table for our application of it:

src/gfx/pal_spec.cpp

@@ -463,7 +463,6 @@ static void parseACTFile(std::filebuf &file) {
 
 static void parseACOFile(std::filebuf &file) {
 	// https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#50577411_pgfId-1055819
-	// http://www.nomodes.com/aco.html
 
 	char buf[10];