[AutoBuild] Add badge with number of dependants to JLL READMEs (#1063)

Author: giordano

src/AutoBuild.jl

@@ -1294,10 +1294,14 @@ function build_jll_package(src_name::String,
     print_product(io, p::Product) = println(io, "* `", typeof(p), "`: `", variable_name(p), "`")
     # Add a README.md
     open(joinpath(code_dir, "README.md"), "w") do io
-        print(io,
-              """
-              # `$(src_name)_jll.jl` (v$(build_version))
-
+        println(io,
+                """
+                # `$(src_name)_jll.jl` (v$(build_version))
+                """)
+        if is_yggdrasil()
+            println(io, "[![deps](https://juliahub.com/docs/$(src_name)_jll/deps.svg)](https://juliahub.com/ui/Packages/$(src_name)_jll/$(Base.package_slug(BinaryBuilder.jll_uuid("$(src_name)_jll"), 5))?page=2)\n")
+        end
+        print(io, """
               This is an autogenerated package constructed using [`BinaryBuilder.jl`](https://github.com/JuliaPackaging/BinaryBuilder.jl).""")
         if is_yggdrasil()
             print(io, " The originating [`build_tarballs.jl`](https://github.com/JuliaPackaging/Yggdrasil/blob/$(yggdrasil_head())/$(ENV["PROJECT"])/build_tarballs.jl) script can be found on [`Yggdrasil`](https://github.com/JuliaPackaging/Yggdrasil/), the community build tree.  If you have any issue, please report it to the Yggdrasil [bug tracker](https://github.com/JuliaPackaging/Yggdrasil/issues).")