- add pthread to WANTLIB
- backport fix for datetime64 on macppc allowing all tests to pass there
- remove use of -funroll-loops with fortran (it causes scipy to segfault
on macppc and it can make code bigger and slower in some cases)
- "optimize function attributes" were added in gcc 4.4. silence those
build-time warnings when building with earlier gcc versions.
c20b84a7c0