[gdk-pixbuf] build: Fix Meson builds using builtin loaders

[Chun-wei Fan <fanchunwei src gnome org>]

commit 6ce0b0bca07ffc709f46abb7bec1b88a5fe5df4a
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Aug 3 17:27:08 2017 +0800

    build: Fix Meson builds using builtin loaders
    
    We need to ensure that the loaders that are to be built into the main
    GDK-Pixbuf library is built as follows:
    
    -The individual loader sources are built with the corresponding
     INCLUDE_xxx macro defined.
    -The GDK-Pixbuf library itself must be built with all of the INCLUDE_xxx
     macros defined for building the individual loaders that we are building
     into the main GDK-Pixbuf library
    
    There is also a typo for the macro to make the loaders built into the
    GDK-Pixbuf library, so correct that as well (-DINCLUDED_xxx ->
    -DINCLUDE_xxx).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=785767

 gdk-pixbuf/meson.build |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gdk-pixbuf/meson.build b/gdk-pixbuf/meson.build
index bc4ef4f..f15ad2b 100644
--- a/gdk-pixbuf/meson.build
+++ b/gdk-pixbuf/meson.build
@@ -99,13 +99,14 @@ foreach l: loaders
   cond = l.get(2, true)
 
   if cond and builtin_loaders.contains(name)
-    included_loaders_cflags += '-DINCLUDED_@0@'.format(name)
+    cflag_for_included_loader = ['-DINCLUDE_@0@'.format(name)]
+    included_loaders_cflags += cflag_for_included_loader
 
     mod = static_library('staticpixbufloader-@0@'.format(name),
                          sources,
                          dependencies: loaders_deps + gdk_pixbuf_deps,
                          include_directories: [ root_inc, gdk_pixbuf_inc ],
-                         c_args: common_cflags + gdk_pixbuf_cflags)
+                         c_args: common_cflags + gdk_pixbuf_cflags + cflag_for_included_loader)
 
     included_loaders_deps += declare_dependency(link_with: mod)
   endif