Try to be a no-op on non-apple

Author: ViralBShah

src/AppleAccelerate.jl

@@ -1,8 +1,9 @@
-__precompile__()
 module AppleAccelerate
 
 using Libdl
 
+if Sys.isapple()
+
 try
     global const libacc = dlopen("/System/Library/Frameworks/Accelerate.framework/Accelerate")
 catch
@@ -15,4 +16,6 @@ include("Array.jl")
 include("DSP.jl")
 include("Util.jl")
 
+end
+
 end # module