Fix 0.6 abstract type declaration depwarn

REQUIRE

@@ -1,4 +1,4 @@
 julia 0.4
 URIParser
 SHA
-Compat 0.9.5
+Compat 0.17.0

appveyor.yml

@@ -33,4 +33,4 @@ build_script:
       Pkg.clone(pwd(), \"BinDeps\"); Pkg.build(\"BinDeps\")"
 
 test_script:
-  - C:\projects\julia\bin\julia -F -e "Pkg.test(\"BinDeps\")"
+  - C:\projects\julia\bin\julia -e "Pkg.test(\"BinDeps\")"

src/BinDeps.jl

@@ -43,7 +43,7 @@ macro make_rule(condition,command)
     end
 end
 
-abstract BuildStep
+@compat abstract type BuildStep end
 
 downloadcmd = nothing
 function download_cmd(url::AbstractString, filename::AbstractString)

src/dependencies.jl

@@ -3,10 +3,10 @@ import Base: show
 const OSNAME = is_windows() ? :Windows : KERNEL
 
 # A dependency provider, if successfully executed will satisfy the dependency
-abstract DependencyProvider
+@compat abstract type DependencyProvider end
 
 # A library helper may be used by `DependencyProvider`s but will by itself not provide the library
-abstract DependencyHelper
+@compat abstract type DependencyHelper end
 
 type PackageContext
     do_install::Bool
@@ -91,7 +91,7 @@ export library_dependency, bindir, srcdir, usrdir, libdir
 
 library_dependency(args...; properties...) = error("No context provided. Did you forget `@BinDeps.setup`?")
 
-abstract PackageManager <: DependencyProvider
+@compat abstract type PackageManager <: DependencyProvider end
 
 DEBIAN_VERSION_REGEX = r"^
     ([0-9]+\:)?                                           # epoch
@@ -227,8 +227,8 @@ libdir(z::Zypper,dep) = ["/usr/lib", "/usr/lib32", "/usr/lib64"]
 # Can use everything else without restriction by default
 can_use(::Type) = true
 
-abstract Sources <: DependencyHelper
-abstract Binaries <: DependencyProvider
+@compat abstract type Sources <: DependencyHelper end
+@compat abstract type Binaries <: DependencyProvider end
 
 #
 # A dummy provider checked for every library that
@@ -261,7 +261,7 @@ end
 
 libdir(p::CustomPathBinaries,dep) = p.path
 
-abstract BuildProcess <: DependencyProvider
+@compat abstract type BuildProcess <: DependencyProvider end
 
 type SimpleBuild <: BuildProcess
     steps