Updated the uinstall command to avoid errors when uninstalling multiple header...

Updated the uinstall command to avoid errors when uninstalling multiple header and/or library files.

CMakeLists.txt

@@ -73,7 +73,8 @@ IF (UNIX)
   ADD_CUSTOM_COMMAND(
     COMMENT "uninstall package"
     COMMAND xargs ARGS rm < install_manifest.txt
-    COMMAND cat install_manifest.txt | xargs -L1 dirname | sudo xargs rmdir -p --ignore-fail-on-non-empty
+    COMMAND rm -rd ${CMAKE_INSTALL_PREFIX}/lib/iri/${PROJECT_NAME}
+    COMMAND rm -rd ${CMAKE_INSTALL_PREFIX}/include/iri/${PROJECT_NAME}
     TARGET  uninstall
   )
 ELSE(UNIX)