Adding an to make the pip wheel invocation more or less verbose

cibuildwheel/windows.py

@@ -7,10 +7,10 @@ except ImportError:
 from collections import namedtuple
 from glob import glob
 
-from .util import prepare_command, Unbuffered
+from .util import prepare_command, get_build_verbosity_flag, Unbuffered
 
 
-def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, skip, environment):
+def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, build_verbosity, skip, environment):
     # Python under AppVeyor/Windows seems to be buffering by default, giving problems interleaving subprocess call output with unflushed calls to 'print'
     sys.stdout.flush()
     sys.stdout = Unbuffered(sys.stdout)
@@ -82,7 +82,7 @@ def build(project_dir, package_name, output_dir, test_command, test_requires, be
             shell([before_build_prepared], env=env)
 
         # build the wheel
-        shell(['pip', 'wheel', abs_project_dir, '-w', built_wheel_dir, '--no-deps'], env=env)
+        shell(['pip', 'wheel', abs_project_dir, '-w', built_wheel_dir, '--no-deps', get_build_verbosity_flag(build_verbosity)], env=env)
         built_wheel = glob(built_wheel_dir+'/*.whl')[0]
 
         # install the wheel