[gobject-introspection] Ignore _Nonnull, _Nullable and _Null_unspecified type qualifiers

[Rico Tzschichholz <ricotz src gnome org>]

commit 6c2d572a34f6240898a2dfb07eb80a50d2a4e59b
Author: David Lechner <david lechnology com>
Date:   Sun Jul 2 17:42:30 2017 -0500

    Ignore _Nonnull,_Nullable and _Null_unspecified type qualifiers
    
    These qualifiers are present in header files on macOS (introduced in
    XCode 7).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784458

 giscanner/scannerlexer.l |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/giscanner/scannerlexer.l b/giscanner/scannerlexer.l
index 21ef570..61c0a92 100644
--- a/giscanner/scannerlexer.l
+++ b/giscanner/scannerlexer.l
@@ -164,6 +164,9 @@ stringtext                          ([^\\\"])|(\\.)
 "__inline__"                            { return INLINE; }
 "__inline"                             { return INLINE; }
 "__nonnull"                            { if (!parse_ignored_macro()) REJECT; }
+"_Nonnull"                             { /* Ignore */ }
+"_Nullable"                            { /* Ignore */ }
+"_Null_unspecified"                    { /* Ignore */ }
 "_Noreturn"                            { /* Ignore */ }
 "__signed"                              { return SIGNED; }
 "__signed__"                           { return SIGNED; }