SCons: Pass env to modules can_build method

This allows to disable modules based on the environment,
in particular `env[tools]` which tells us if we are
building the editor or not.

modules/tinyexr/config.py

@@ -1,9 +1,5 @@
-def can_build(platform):
-    return True
+def can_build(env, platform):
+    return env['tools']
 
 def configure(env):
-    # Tools only, disabled for non-tools
-    # TODO: Find a cleaner way to achieve that
-    if not env['tools']:
-        env['module_tinyexr_enabled'] = False
-        env.disabled_modules.append("tinyexr")
+    pass