- OSL support is no longer optional. It complicated the code and the
build system, and developers' intention is to make OSL a first-class
citizen in appleseed; keeping OSL optional did not allow moving in
that direction
- Add a work-around for Core Working Group (CWG) Defect 253: prior to
GCC 4.6.4 and Clang 3.9.0, C++ required a user-provided default ctor
to default-construct a const object [*], and we still have supported
FreeBSD versions where Clang behaves the old way
[*] https://stackoverflow.com/questions/7411515
Because GitHub releases (tarballs) are not fetched with correct modification
time, set TIMESTAMP to 1501170801 which corresponds to commit ae7f346 tagged
as this release.
c10df5b9df