wmakeBuildInfo bash3 compatibility

There is a problem with using declare -A in wmakeBuildInfo if your bash version is less than 4 as associative arrays aren't available until version 4. The libraries will build, except the global.Cver, which will be wrong and cause problems when building the applications. It would be nice if there was a check for this and fixed to work even for bash version 3.

Sounds like we'd then need to drop the hashes and move to flat variables. This probably isn't too terrible, since there aren't that many values around.

Not sure if this is should be a bugfix, or something for develop and the next release. Thoughts?

assigned to @mark

moved from Community/OpenFOAM-addOns#13

closed via commit 1fee0429fd45d5c6c47d63cbccc026f935f985d6

mentioned in commit 1fee0429fd45d5c6c47d63cbccc026f935f985d6

mentioned in commit 975eb388