[libdazzle/mcatanzaro/subproject] Fix subproject build with meson 0.50.0

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a7bbebbf264efb8a2a45eac965111007a9610d19
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Thu Mar 21 09:58:32 2019 -0500

    Fix subproject build with meson 0.50.0
    
    meson 0.50.0 gives a fatal error if add_global_arguments() is used in a
    subproject. We could easily set -DG_DISABLE_CAST_CHECKS globally only
    when not building a subproject, or just set it only for release_args.
    
    Fixes epiphany#699

 meson.build | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 5c05672..fe61219 100644
--- a/meson.build
+++ b/meson.build
@@ -137,8 +137,7 @@ test_link_args = [
 ]
 if not get_option('buildtype').startswith('debug')
   # TODO: Maybe reuse 'b_ndebug' option
-  add_global_arguments(['-DG_DISABLE_CAST_CHECKS'], language: 'c')
-  release_args += [ '-DG_DISABLE_ASSERT' ]
+  release_args += [ '-DG_DISABLE_ASSERT', '-DG_DISABLE_CAST_CHECKS' ]
   test_link_args += [
     '-Wl,-Bsymbolic',
     '-fno-plt',