build appstream from source and generate vapi

this might fix the nightly flatpak(?)

build-aux/flatpak/io.github.kolunmi.Bazaar.json

@@ -106,6 +106,41 @@
             }
           ]
         },
+        {
+          "name": "appstream",
+          "buildsystem": "meson",
+          "config-opts": [
+            "-Dgir=true",
+            "-Dvapi=true",
+            "-Ddocs=false"
+          ],
+          "sources": [
+            {
+              "type": "git",
+              "url": "https://github.com/ximion/appstream.git",
+              "commit": "ce52fb058e06f1f36320911e93e6773c6e3fe82e",
+              "tag": "v1.2.0"
+            }
+          ],
+          "modules": [
+            {
+              "name": "libstemmer",
+              "buildsystem": "simple",
+              "build-commands": [
+                "make",
+                "install -Dm644 include/libstemmer.h -t \"${FLATPAK_DEST}/include\"",
+                "install -Dm644 libstemmer.a \"${FLATPAK_DEST}/lib/\""
+              ],
+              "sources": [
+                {
+                  "type": "archive",
+                  "url": "https://snowballstem.org/dist/libstemmer_c-3.1.1.tar.gz",
+                  "sha256": "0e82fb0e29006cad2831b4b25980a1dae85959c6a1faaaf96547f551e352042a"
+                }
+              ]
+            }
+          ]
+        },
         {
           "name": "flatpak",
           "buildsystem": "meson",

src/meson.build

@@ -400,6 +400,7 @@ vala_deps = [
   gtk_dep,
   libadwaita_dep,
   libdex_dep,
+  appstream_dep,
 ]
 vala_sources = files(
   'bz.vapi',
@@ -422,18 +423,12 @@ if get_option('sandboxed_libflatpak')
   vala_args += ['--define=SANDBOXED_LIBFLATPAK']
 endif
 
-appstream_incdir = include_directories(
-  appstream_dep.get_pkgconfig_variable('includedir') / 'appstream',
-  is_system: true,
-)
-
 bz_vala_static = static_library(
   'bzvala', vala_sources,
   sources: [bz_resources],
   dependencies: vala_deps,
   vala_header: 'bzvala.h',
   vala_args: vala_args,
-  include_directories: [appstream_incdir],
   c_args: [
     '-DGETTEXT_PACKAGE="' + meson.project_name() + '"',
   ],