[gtk+] build: Fix generating introspection on MacOS

[Emmanuele Bassi <ebassi src gnome org>]

commit a52ff2f66e670874978762197b2984fa8bdf3bfd
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Mar 10 22:12:32 2015 +0000

    build: Fix generating introspection on MacOS
    
    We need to filter out platform-specific sources from the files that we
    use with the introspection scanner.
    
    In this specific case I could have moved the gtkclipboard-quartz.c and
    the gtkdnd-quartz.c files out of the $(gtk_base_c_sources) variable, but
    doing a filter-out on the variable itself is more resilient in case we
    eventually add files and we forget about the result.

 gtk/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 9a82859..83dfe31 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -1330,7 +1330,7 @@ distclean-local:
 if HAVE_INTROSPECTION
 introspection_files = \
     $(filter-out %private.h gtktextdisplay.h gtktextlayout.h gtkx.h, $(gtkinclude_HEADERS) 
$(a11yinclude_HEADERS) $(deprecatedinclude_HEADERS)) \
-    $(gtk_base_c_sources) \
+    $(filter-out %win32.c %quartz.c, $(gtk_base_c_sources)) \
     gtkprintoperation-unix.c \
     gtktypebuiltins.h \
     gtktypebuiltins.c