Shared libraries lost versions in 6.2.0

For example:
```
lib/libgecodeset.so
lib/libgecodeset.so.%%SHLIB_VERSION%%
lib/libgecodeset.so.%%SHLIB_VERSION%%.0
lib/libgecodesupport.so
lib/libgecodesupport.so.%%SHLIB_VERSION%%
lib/libgecodesupport.so.%%SHLIB_VERSION%%.0
```
became
```
lib/libgecodeset.so
lib/libgecodesupport.so
```