link-grammar: update to 5.10.2

Version 5.10.2 (16 Sept 2021)
* Fix python install path.
* Fix size in brand-new `link-generator` (hits 32-bit & ARM) #1247

Version 5.10.1 (7 Sept 2021)
* Fix perl bindings build fail. #1248

Version 5.10.0 (4 September 2021)
* Expanded English vocabulary
* Support dictionary "#define allow-duplicate-words true". #1204
* Fix crash for sentences containing wildcard words. #1206
* Connector names starting with "ID" are no longer reserved. #1208
* Connector names starting with underbar are reserved for internal use.
* ".I" subscripts are no longer reserved; "._" subscripts are reserved.
  These last three changes introduce linkage incompatibilities.
* Fix parsing with nulls when using an sqlite3 dictionary.
* Fix regexes for NetBSD when using libc regexes. #1223
* English dict: fix many "how?" questions.
* English dict: fix conditional sentences #1240

(gutteridge)