No longer depend on pywin32 since we removed winshell

Make importlib_metadata requirement unconditional to get us one step
closer to being able to build a noarch package, though we can't
relistically do that until a new pyqtgraph is in the anaconda repos.

Author: chrisjbillington

setup.cfg

@@ -25,12 +25,11 @@ include_package_data = True
 packages = labscript_utils, labscript_profile
 python_requires = >=3.6
 install_requires =
-  importlib_metadata>=1.0 ; python_version<'3.8'
+  importlib_metadata>=1.0
   h5py>=2.9
   numpy>=1.15
   pyqtgraph>=0.11.0rc0 ; python_version>='3.8'
   pyqtgraph ; python_version<'3.8'
-  pywin32 ; sys_platform=='win32'
   qtutils>=2.2.3
   scipy
   setuptools_scm