sasview: fix build (#40433)

The package breaks currently breaks with the following message:

```
fixed-output derivation produced path '/nix/store/5dh1mdj027ad8sprk12fqa5h5bpdxs5n-sasview' with sha256 hash '12k1w4yq1mzjxcp2cqb562c7cbwzhi54rsbmgi0fax0i1660q167' instead of the expected hash '05la54wwzzlkhmj8vkr0bvzagyib6z6mgwqbddzjs5y1wd48vpcx'
```

To fix the build the following changes were applied:

* Switched to latest master for now as the older releases have a broken
  `py.test` configuration and altering hashes.

* Added `checkPhase` which invokes `py.test` directly and drops
  duplicated files from `dist/tmpbuild`.

* Rebased the patches `pyparsing-fix.patch` and `local_config.patch` for
  the latest master revision.

Additionally refer to the discussion in #40381 for further reference.

pkgs/applications/science/misc/sasview/local_config.patch

@@ -1,10 +1,22 @@
+diff --git a/src/sas/_config.py b/src/sas/_config.py
+index ece08fd4c..926768593 100644
 --- a/src/sas/_config.py
 +++ b/src/sas/_config.py
-@@ -70,2 +70,2 @@
+@@ -67,8 +67,8 @@ def load_local_config(app_dir):
+         logger.info("GuiManager loaded %s", path)
+         return module
+     except Exception as exc:
 -        logger.critical("Error loading %s: %s", path, exc)
 -        sys.exit()
 +        import sas.sasview.local_config
 +        return sas.sasview.local_config
--- 
-2.15.0
-
+ 
+ def make_custom_config_path(user_dir):
+     """
+@@ -116,4 +116,4 @@ def load_custom_config(path):
+ 
+     from sas.sasview import custom_config
+     logger.info("GuiManager custom_config defaults to sas.sasview.custom_config")
+-    return custom_config
+\ No newline at end of file
++    return custom_config