Fix directory name and library name comparison

Author: ianfixes

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Removed
 
 ### Fixed
+- Warnings about directory name mismatches are now based on proper comparison of strings
 
 ### Security
 

exe/arduino_ci.rb

@@ -435,7 +435,7 @@ def perform_example_compilation_tests(cpp_library, config)
 end
 
 assumed_name = @backend.name_of_library(cpp_library_path)
-ondisk_name = cpp_library_path.realpath.basename
+ondisk_name = cpp_library_path.realpath.basename.to_s
 if assumed_name != ondisk_name
   inform("WARNING") { "Installed library named '#{assumed_name}' has directory name '#{ondisk_name}'" }
 end