[gtk/wip/jtojnar/trivial-fix-pc-vulcan] build: Fix vulkan reference in pc file

[Jan Tojnar <jtojnar src gnome org>]

commit 7d5826ccf7a8d5ad39f370a3f214e4811ca1075b
Author: Jan Tojnar <jtojnar gmail com>
Date:   Sun Dec 27 06:42:29 2020 +0100

    build: Fix vulkan reference in pc file
    
    A mistake in string concatenation caused the vulcan dependency to be omitted.
    
    Fixes: https://gitlab.gnome.org/GNOME/gtk/-/issues/3517

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index bb58717f6a..60e7729a8e 100644
--- a/meson.build
+++ b/meson.build
@@ -723,7 +723,7 @@ if cairogobj_pkg_found
 endif
 
 if vulkan_pkg_found
-  gdk_packages += 'vulkan'
+  gdk_packages += ' vulkan'
 endif
 
 pkgconf.set('GDK_PACKAGES', gdk_packages)