message: build: remove plugin_no_soname from mac qt qmake.conf
  plugin_no_soname was removed from Qt some time ago, see upstream commit
  It was replaced with
  plugin_with_soname, however that is currently only used (as of 5.15.x)
  in the Android Clang mkspec.
diff: MAKEFILE_GENERATOR = UNIX
  -CONFIG += app_bundle incremental global_init_link_order lib_version_first plugin_no_soname absolute_library_soname
  +CONFIG += app_bundle incremental global_init_link_order lib_version_first absolute_library_soname
  QMAKE_INCREMENTAL_STYLE = sublib
  include(../common/macx.conf)
  include(../common/gcc-base-mac.conf)
  