Bug 1514448 - Only check for fxc/wine when building with a compile environment. r=froydnj

Bug 1514089 moved the check from toolchain.configure, which is only
included when a compile environment is available, to toolkit/moz.configure,
which doesn't have this limitation. As a consequence, artifact/l10n builds
ended up requiring those tools, while they didn't require them before.

Differential Revision: https://phabricator.services.mozilla.com/D14675

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

toolkit/moz.configure

@@ -1273,6 +1273,7 @@ set_config('MOZ_LAYOUT_DEBUGGER', depends_if('--enable-layout-debugger')(lambda
 # Shader Compiler for Windows (and MinGW Cross Compile)
 # ==============================================================
 
+with only_when(compile_environment):
     fxc = check_prog('FXC', ('fxc.exe', 'fxc2.exe'), when=depends(target)
                      (lambda t: t.kernel == 'WINNT'))
     wine = check_prog('WINE', ['wine'], when=depends(target, host)