message: builds: don't pass -silent to qt when building in debug mode
  This means we'll get build output like this when building with DEBUG=1:
  g++ -c -pipe -ffunction-sections -O2 -fPIC -std=c++11 -fno-exceptions <lots more> ../../corelib/kernel/qcoreapplication.cpp
  rather than just:
  compiling ../../corelib/kernel/qcoreapplication.cpp
diff: @@ -26,6 +26,7 @@ $(package)_extra_sources += $($(package)_qttools_file_name)
  define $(package)_set_vars
  $(package)_config_opts_release = -release
  +$(package)_config_opts_release += -silent
  $(package)_config_opts_debug = -debug
  $(package)_config_opts += -bindir $(build_prefix)/bin
  $(package)_config_opts += -c++std c++11
  @@ -77,7 +78,6 @@ $(package)_config_opts += -qt-pcre
  $(package)_config_opts += -qt-harfbuzz
  $(package)_config_opts += -system-zlib
  $(package)_config_opts += -static
  -$(package)_config_opts += -silent
  $(package)_config_opts += -v
  $(package)_config_opts += -no-feature-bearermanagement
  $(package)_config_opts += -no-feature-colordialog
  