dundargoc f31f260f0c build: rework --version generation ...

Having a dynamically generated string is more maintainable than having
multiple files.

Also add linker flags and any potential LTO flags to the --version
output.

2023-12-15 00:19:38 +01:00

..

iwyu

…

CMakeLists.txt

…

config.h.in

…

pathdef.c.in

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versiondef.h.in

…