Fixes for Libdl moving to the stdlib (#72)

Author: ararslan

deps/build.jl

@@ -1,6 +1,10 @@
 using Compat
 using Compat.Sys: isapple, islinux, iswindows
 
+if VERSION >= v"0.7.0-DEV.3382"
+    using Libdl
+end
+
 did_setup = false
 
 if VERSION < v"0.7.0-DEV.1760"

deps/scratch.jl

@@ -4,6 +4,10 @@ using BinDeps
 using BinDeps: libdir, srcdir, includedir, depsdir, builddir
 using Base.Math: libm
 
+if VERSION >= v"0.7.0-DEV.3382"
+    using Libdl
+end
+
 # Don't call setup again if we're being included from binaries.jl
 if !did_setup
     BinDeps.@setup