Fix compilation with `NPNR_DISABLE_THREADS`.

Only delete old context after emitting context changed wiht new conte…

…xt when inporting json

gowin: Add timings for BRAM

Signed-off-by: gatecat <gatecat@ds0.me>

heap: Allow chains to ripup other chains (opt-in only) (#1552)

Signed-off-by: gatecat <gatecat@ds0.me>

Gowin. Fix non-DCS networks. (#1467)

Prohibits the use of Dynamic Clock Selection PIPs for networks where no
DCS is present.

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>

gowin: Himbaechel. Fix the style.

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>

 rename c++20 keyword s/requires/requires_range.

 See https://en.cppreference.com/w/cpp/language/requires for more details.

clangformat

Signed-off-by: gatecat <gatecat@ds0.me>

fabulous: fix, but disable, IO configuration

Signed-off-by: gatecat <gatecat@ds0.me>

Merge pull request #971 from modwizcode/fix-tbb-macos

cmake: properly include TBB libraries.