[gnome-builder] flatpak: work around gvls build failure

[Christian Hergert <chergert src gnome org>]

commit d4a4340398500f7a74b964ff7519b695653f7acc
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jan 4 11:04:19 2020 -0800

    flatpak: work around gvls build failure

 build-aux/flatpak/gvls-fix-vapi-install-dir.patch | 22 ++++++++++++++++++++++
 build-aux/flatpak/org.gnome.Builder.json          |  4 ++++
 2 files changed, 26 insertions(+)
---
diff --git a/build-aux/flatpak/gvls-fix-vapi-install-dir.patch 
b/build-aux/flatpak/gvls-fix-vapi-install-dir.patch
new file mode 100644
index 000000000..d6e7dadf2
--- /dev/null
+++ b/build-aux/flatpak/gvls-fix-vapi-install-dir.patch
@@ -0,0 +1,22 @@
+From 14f31ee20b231ee59732eae15c8cc241ededc4d5 Mon Sep 17 00:00:00 2001
+From: Christian Hergert <chergert redhat com>
+Date: Sat, 4 Jan 2020 11:03:20 -0800
+Subject: [PATCH] gvls: fix vapi install dir
+
+---
+ src/meson.build | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/meson.build b/src/meson.build
+index 2888d6c..e47bfb8 100644
+--- a/src/meson.build
++++ b/src/meson.build
+@@ -1,4 +1,4 @@
+-vapidir = join_paths (vala_dep.get_pkgconfig_variable ('datadir'),'vala','vapi')
++vapidir = join_paths (get_option('datadir'),'vala','vapi')
+ GIR_NAME= VERSIONED_CAMEL_CASE_NAME+'.gir'
+ TYPELIB_NAME= VERSIONED_CAMEL_CASE_NAME+'.typelib'
+ VAPI_NAME = VERSIONED_PROJECT_NAME+'.vapi'
+-- 
+2.23.0
+
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index 6e4a4bf6c..2bf78b362 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -601,6 +601,10 @@
                 {
                     "type" : "git",
                     "url" : "https://gitlab.gnome.org/esodan/gvls.git";
+                },
+                {
+                    "type" : "patch",
+                    "path" : "gvls-fix-vapi-install-dir.patch"
                 }
             ]
         },