netcdf-c package: Skip problematic post install on Windows (#43039)

#42878 adds a post install filter of the netCDFConfig.cmake file
that replaces a valid CMake target on Windows with an invalid one.
Don't do this replacement on Windows.

var/spack/repos/builtin/packages/netcdf-c/package.py

@@ -358,6 +358,8 @@ def patch_hdf5_pkgconfigcmake(self):
         due to incorrectly using hdf5 target names
         https://github.com/spack/spack/pull/42878
         """
+        if sys.platform == "win32":
+            return
 
         pkgconfig_file = find(self.prefix, "netcdf.pc", recursive=True)
         cmakeconfig_file = find(self.prefix, "netCDFTargets.cmake", recursive=True)