CMake: move find_package for lzma and secretstore to init.cmake

build/cmake/init.cmake

@@ -154,6 +154,20 @@ if(wxUSE_THREADS)
     find_package(Threads REQUIRED)
 endif()
 
+if(wxUSE_LIBLZMA)
+    find_package(LibLZMA REQUIRED)
+endif()
+
+if(UNIX AND wxUSE_SECRETSTORE)
+    # The required APIs are always available under MSW and OS X but we must
+    # have GNOME libsecret under Unix to be able to compile this class.
+    find_package(Libsecret REQUIRED)
+    if(NOT LIBSECRET_FOUND)
+        message(WARNING "libsecret not found, wxSecretStore won't be available")
+        wx_option_force_value(wxUSE_SECRETSTORE OFF)
+    endif()
+endif()
+
 if(wxUSE_GUI)
     if(WXMSW AND wxUSE_METAFILE)
         # this one should probably be made separately configurable