Don't install curl tool

We only need the libcurl library. Building and installing the curl tool
leads to a build failure under Windows because of a missing "strip"
utility.

kiwixbuild/dependencies/libcurl.py

@@ -54,6 +54,7 @@ class LibCurl(Dependency):
                 "smb",
                 "smtp",
                 "gopher",
+                "tool",
             )
         ]