Consider libraries installed if their path is a symlink

Author: ianfixes

Diff for: CHANGELOG.md

@@ -45,6 +45,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - A copy/paste error that prevented compiler warning flags from being supplied has been fixed, via jgfoster
 - RSpec was not communicating compile errors from unit test executables that failed to build. Now it does, via jgfoster
 - Windows paths now avoid picking up backslashes, for proper equality comparisons
+- Libraries are now considered installed if their entry is a symlink (for which `exist?` would return `false`)
 
 ### Security
 

Diff for: lib/arduino_ci/cpp_library.rb

@@ -98,7 +98,7 @@ def examples_dir
     #
     # @return [bool]
     def installed?
-      path.exist?
+      path.exist? || path.symlink?
     end
 
     # install a library by name