pw_build: Remove deprecated Python lint option

The 'lint' boolean was replaced by a 'static_analysis' list.

Change-Id: I29e2a7722ad48133ef00664f908dc8fcec9abe46
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45360
Reviewed-by: Armando Montanez <amontanez@google.com>
Commit-Queue: Wyatt Hepler <hepler@google.com>

pw_build/python.gni

diff --git a/pw_build/python.gni b/pw_build/python.gni
index a68da03..de56f91 100644
--- a/pw_build/python.gni
+++ b/pw_build/python.gni
@@ -244,19 +244,6 @@
     _static_analysis = invoker.static_analysis
   }
 
-  # TODO(hepler): Remove support for the lint option.
-  if (defined(invoker.lint)) {
-    assert(!defined(invoker.static_analysis),
-           "'lint' is deprecated; use 'static_analysis' instead")
-
-    # Only allow 'lint = false', for backwards compatibility.
-    assert(invoker.lint == false, "'lint' is deprecated; use 'static_analysis'")
-    print("WARNING:",
-          "The 'lint' option for pw_python_package is deprecated.",
-          "Instead, use 'static_analysis = []' to disable linting.")
-    _static_analysis = []
-  }
-
   foreach(_tool, _static_analysis) {
     assert(_supported_static_analysis_tools + [ _tool ] - [ _tool ] !=
                _supported_static_analysis_tools,