build: pass flex and bison to the interior cmake invocation#77
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RegsGen2 is built via `ExternalProject_Add`, which reconfigures in its own isolated build tree rather than inheriting the top-level cache. On Windows, where flex/bison aren't on `Path` and must be located with `-D FLEX_EXECUTABLE=`/`-D BISON_EXECUTABLE=`, the outer configure would find them but the RegsGen2 subbuild's own `find_package(FLEX)`/ `find_package(BISON)` calls would fail, breaking the JSObjects `FLEX_TARGET`/`BISON_TARGET` use there. Forward `FLEX_EXECUTABLE`/`BISON_EXECUTABLE` into RegsGen2's `CMAKE_ARGS` when set, so the subbuild can locate them the same way the outer project does.
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These tools are used to generate
regsgenand not by DS2. Pass along the paths to the interior cmake invocation so that when they are not in the path the configure succeeds.