Revert "pin extlib to 1.7.9"

This reverts commit 2f1e6d41163cc96e0d975dcc31b8ad2d027a9ba5.

haxe.opam

@@ -25,7 +25,7 @@ depends: [
   "dune" {>= "1.11" & < "3.16"}
   "sedlex" {>= "2.0"}
   "xml-light"
-  "extlib" {= "1.7.9"}
+  "extlib" {>= "1.7.8"}
   "ptmap" {>= "2.0.0"}
   "sha"
   "camlp-streams"