[recipes] Use #ifdef for conditionally compiled code

[Matthias Clasen <matthiasc src gnome org>]

commit ffe0d8af920b993bae75031d5cd06e8dc09db8fc
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Feb 17 20:39:57 2017 -0500

    Use #ifdef for conditionally compiled code
    
    This is the common way of doing it. Lets be consistent.

 src/gr-about-dialog.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/gr-about-dialog.c b/src/gr-about-dialog.c
index cde6b9c..d6ca308 100644
--- a/src/gr-about-dialog.c
+++ b/src/gr-about-dialog.c
@@ -366,12 +366,12 @@ populate_system_tab (GtkTextView *view)
                 text_buffer_append (buffer, _("Bundled libraries"));
                 text_buffer_append (buffer, "\n");
 
-#if ENABLE_AUTOAR
+#ifdef ENABLE_AUTOAR
                 text_buffer_append_printf (buffer, "\tgnome-autoar\t%s\t", AUTOAR_VERSION);
                 text_buffer_append_link (view, buffer, "LGPLv2", 
"http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html";);
                 text_buffer_append (buffer, "\n");
 #endif
-#if ENABLE_GSPELL
+#ifdef ENABLE_GSPELL
                 text_buffer_append_printf (buffer, "\tgspell\t%s\t", GSPELL_VERSION);
                 text_buffer_append_link (view, buffer, "LGPLv2", 
"http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html";);
                 text_buffer_append (buffer, "\n");
@@ -396,10 +396,10 @@ populate_system_tab (GtkTextView *view)
                                            gtk_get_major_version (),
                                            gtk_get_minor_version (),
                                            gtk_get_micro_version ());
-#if ENABLE_AUTOAR
+#ifdef ENABLE_AUTOAR
                 text_buffer_append_printf (buffer, "\tgnome-autoar\t%s\n", AUTOAR_VERSION);
 #endif
-#if ENABLE_GSPELL
+#ifdef ENABLE_GSPELL
                 text_buffer_append_printf (buffer, "\tgspell\t%s\n", GSPELL_VERSION);
 #endif
 #ifdef ENABLE_CANBERRA