tests: Skip lint tests if bash is not available

They all require bash.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

tests/meson.build

@@ -8,6 +8,7 @@ lint_scripts = [
   'shellcheck.sh',
 ]
 
+if have_bash
   foreach test_name : lint_scripts
     test(
       test_name, files(test_name),
@@ -16,6 +17,7 @@ foreach test_name : lint_scripts
       protocol : 'tap',
     )
   endforeach
+endif
 
 test(
   'check-missing-install-tag.py',