Request 96784 (accepted)

- Update to new upstream release 3.12.1
* string: make HX_strdup(NULL) valid again
* build: fix build when -Wl,--no-undefined is used

- Update to new upstream release 3.12.1
* string: make HX_strdup(NULL) valid again
* build: fix build when -Wl,--no-undefined is used

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{"approve": "preliminary, version number changed"}

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