BR tcsh so we can test csh activation scripts

With this change, tests in tests/unit/activation/test_csh.py are no
longer skipped.

python-virtualenv.spec

@@ -1,6 +1,6 @@
 Name:           python-virtualenv
 Version:        20.13.3
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Tool to create isolated Python environments
 
 License:        MIT
@@ -32,6 +32,7 @@ BuildRequires:  python3-towncrier
 %bcond_without tests
 %if %{with tests}
 BuildRequires:  fish
+BuildRequires:  tcsh
 BuildRequires:  gcc
 BuildRequires:  python3-flaky
 BuildRequires:  python3-packaging
@@ -157,6 +158,9 @@ rm -r tmp_path
 
 
 %changelog
+* Mon Mar 14 2022 Benjamin A. Beasley <code@musicinmybrain.net> - 20.13.3-3
+- BR tcsh so we can test csh activation scripts
+
 * Mon Mar 14 2022 Lumír Balhar <lbalhar@redhat.com> - 20.13.3-2
 - Add explicit error when embed version of wheels is requested
 Resolves: rhbz#2053948