Fix removal of Alire Build Targets' aliases

This should be done only when reloading a non-Alire project: if
an Alire project gets reloaded, we want to keep the aliases.

For eng/ide/gnatstudio#30

Author: AnthonyLeonardoGracio

share/support/core/alire.py

@@ -284,7 +284,8 @@ def display_message(timeout):
         # Alire is being ran
         timeout = GPS.Timeout(100, display_message)
         timeout.counter = 0
-    else:
+
+    elif not GPS.getenv("ALIRE"):
         # We are not loading an Alire project: unset the aliases
         # on Alire build targets.
         update_aliases_for_alire_targets(is_alire_project=False)