Update compressed_archive to support the latest version of 7zip 18.05

p7zip has been abandoned and the latest version available is 16.02.

config.pri

@@ -30,10 +30,18 @@ CONFIG(no_opengl) {
 }
 
 # default value for comic archive decompression backend
-!CONFIG(unarr):!CONFIG(7zip) {
+unix:!macx:!CONFIG(unarr):!CONFIG(7zip) {
   CONFIG += unarr
 }
 
+win32:!CONFIG(unarr):!CONFIG(7zip) {
+  CONFIG += 7zip
+}
+
+macx:!CONFIG(unarr):!CONFIG(7zip) {
+  CONFIG += 7zip
+}
+
 # default values for pdf render backend
 win32:!CONFIG(poppler):!CONFIG(pdfium):!CONFIG(no_pdf) {
   CONFIG += pdfium