debian: Enable parallelism, fix double-conversion dependency

* Remove patches:
  * folly
  * generated_files_prebuild
  * disable_libncurses
  * remove_boost_regex_hhvm

* Update patches:
  * use_system_libzip
  * prefer_libedit_over_libreadline
  * typos
  * remove_libpam
  * use_system_libsqlite3
  * use_system_lz4
  * use_system_double_conversion