Programming/cmake: fixes and new version 3.13.3

- use system libcurl on all systems, otherwise https doesn't work

Programming/cmake/3/variants

@@ -5,3 +5,4 @@ cmake/3.6.3          stable
 cmake/3.8.1          stable
 cmake/3.9.6          stable
 cmake/3.10.3         stable b:gcc/7.3.0
+cmake/3.13.3         unstable b:gcc/7.3.0

Programming/cmake/build

@@ -5,7 +5,7 @@ pbuild::add_to_group 'Programming'
 
 declare bootstrap_flags=''
 
-pbuild::pre_configure_Darwin() {
+pbuild::pre_configure() {
 	bootstrap_flags+='--system-curl'
 }