Revert "formula: runtime deps of build deps aren't runtime"

Author: ilovezfs

Library/Homebrew/formula.rb

@@ -1505,7 +1505,7 @@ def recursive_requirements(&block)
   # Returns a list of Dependency objects that are required at runtime.
   # @private
   def runtime_dependencies
-    recursive_dependencies { |_, dep| Dependency.prune if dep.build? }
+    recursive_dependencies.reject(&:build?)
   end
 
   # Returns a list of formulae depended on by this formula that aren't

Library/Homebrew/test/formula_test.rb

@@ -651,19 +651,12 @@ def test_dependencies
 
     f4 = formula("f4") do
       url "f4-1.0"
-      depends_on "f1"
+      depends_on "f3"
     end
-    stub_formula_loader f4
 
-    f5 = formula("f5") do
-      url "f5-1.0"
-      depends_on "f3" => :build
-      depends_on "f4"
-    end
-
-    assert_equal %w[f3 f4], f5.deps.map(&:name)
-    assert_equal %w[f1 f2 f3 f4], f5.recursive_dependencies.map(&:name)
-    assert_equal %w[f1 f4], f5.runtime_dependencies.map(&:name)
+    assert_equal %w[f3], f4.deps.map(&:name)
+    assert_equal %w[f1 f2 f3], f4.recursive_dependencies.map(&:name)
+    assert_equal %w[f2 f3], f4.runtime_dependencies.map(&:name)
   end
 
   def test_to_hash