Bug 1608326 - only check for wasm tools when compiling; r=firefox-build-system-reviewers,chmanchester

...so that we can correctly declare that we are using sandboxed
library(ies) from our "parent" build, but not check for all the tools to
compile code.

Depends on D59554

Differential Revision: https://phabricator.services.mozilla.com/D59555

--HG--
extra : moz-landing-system : lando

toolkit/moz.configure

@@ -1782,7 +1782,7 @@ def requires_wasm_sandboxing(libraries):
 set_config('MOZ_USING_WASM_SANDBOXING', requires_wasm_sandboxing)
 set_define('MOZ_USING_WASM_SANDBOXING', requires_wasm_sandboxing)
 
-with only_when(requires_wasm_sandboxing):
+with only_when(requires_wasm_sandboxing & compile_environment):
     lucetc = check_prog('LUCETC', ['lucetc'],
                         paths=toolchain_search_path)