Remove unused dependency on protobuf.

etc/requirements.txt

@@ -2,8 +2,6 @@ cython==0.29.24
 flatbuffers==2.0
 pyside2==5.15.2
 qasync==0.22.0
-protobuf==3.18.0
-mypy-protobuf==3.0.0
 eventfd==0.2
 psutil==5.8.0
 ruamel.yaml==0.17.16

wscript

@@ -101,7 +101,6 @@ def configure(ctx):
     ctx.load('build_utils.waf.qml', tooldir='.')
     ctx.load('build_utils.waf.python', tooldir='.')
     ctx.load('build_utils.waf.cython', tooldir='.')
-    ctx.load('build_utils.waf.proto', tooldir='.')
     ctx.load('build_utils.waf.flatbuffers', tooldir='.')
 
     ctx.env.DATADIR = os.path.join(ctx.env.PREFIX, 'share', 'noisicaa')
@@ -114,7 +113,6 @@ def configure(ctx):
 
     ctx.check_cfg(atleast_pkgconfig_version='0.29')
     ctx.pkg_config('JACK', 'jack', '1.9')
-    ctx.pkg_config('PROTOBUF', 'protobuf', '3.6')
     ctx.pkg_config('FLATBUFFERS', 'flatbuffers', '2.0.0')
     ctx.pkg_config('SWRESAMPLE', 'libswresample', '1.2')
     ctx.pkg_config('AVUTIL', 'libavutil', '54')
@@ -124,8 +122,6 @@ def configure(ctx):
     ctx.check(header_name='dep_sort_stl.h', features='cxx cxxprogram')
 
     ctx.check_python_module('flatbuffers', condition="ver >= num(2, 0)")
-    ctx.check_python_module('google.protobuf', condition="ver >= num(3, 18)")
-    ctx.check_python_module('mypy_protobuf.main', condition="ver >= num(3, 0)")
     ctx.check_python_module('eventfd')  # has no __version__
 
     ctx.find_program('faust')