Make the sublibraries public, as intended

Author: Mikolaj

horde-ad.cabal

@@ -187,6 +187,7 @@ library
 
 library exampleLibrary
     import:           options
+    visibility:       public
 
     exposed-modules:  MnistData
                       MnistCnnRanked2
@@ -213,6 +214,7 @@ library exampleLibrary
 
 library benchCommonLibrary
     import:           options
+    visibility:       public
 
     exposed-modules:  BenchMnistTools
                       BenchProdTools
@@ -335,6 +337,7 @@ benchmark realisticMnistBench
 
 library testToolLibrary
     import:           options
+    visibility:       public
 
     exposed-modules:  CrossTesting
                       EqEpsilon
@@ -353,6 +356,7 @@ library testToolLibrary
 
 library testCommonLibrary
     import:           options
+    visibility:       public
 
     exposed-modules:  TestAdaptorSimplified
                       TestConvSimplified