Use the right option to build kiwix_desktop and pugixml on flatpak.

kiwixbuild/dependencies/kiwix_desktop.py

@@ -14,6 +14,8 @@ class KiwixDesktop(Dependency):
         dependencies = ["qt", "qtwebengine", "kiwix-lib", "aria2"]
         @property
         def configure_option(self):
+            if self.buildEnv.platformInfo.name == 'flatpak':
+                return []
             options = ["PREFIX={}".format(self.buildEnv.install_dir)]
             if self.buildEnv.platformInfo.static:
                 options.append('"CONFIG+=static"')

kiwixbuild/dependencies/pugixml.py

@@ -12,5 +12,6 @@ class Pugixml(Dependency):
         archive = Remotefile('pugixml-1.2.tar.gz',
                              '0f422dad86da0a2e56a37fb2a88376aae6e931f22cc8b956978460c9db06136b')
         patches = ["pugixml_meson.patch"]
+        flatpak_dest = "src"
 
     Builder = MesonBuilder