- Fix source url
- Use ninja for building

- Update to version 3.8.3.0:
* Changed on project Scope
+ Preference file path may be set using the GR_PREFS_PATH
environment variable
+ Lower message latency, previously slow when block aliases
were used
+ PMT: is_dict() no longer returns True for PMT pairs, only
for PMT dicts
+ Util gnuradio-config-info gets --print-all for those that
want it all
+ Allow Thrift versions up thorugh 0.13
+ (internal) Build system improvements and fixes
+ (internal) Reduce Boost usage by replacing bind() with lambdas
supported in C++11
* OOT Support
+ Allow override of gr python dir by setting -DGR_PYTHON_DIR
+ Modtool will not try to add duplicate block names in a module
+ Modtool can non-interactively add blocks with no parameters
(--argument-list="")
+ Modtool will use current installation prefix instead of
/usr/local as source of templates
* GRC
+ Better handling of gui hints, avoid hiding widgets in cases
where some have GUI hints and some do not
+ Dark theme detection fix
+ Add window size option for bokeh gui
* gr-audio