mysql: remove duplicate test conditional

Formula/mysql.rb

@@ -90,13 +90,6 @@ class Mysql < Formula
     # Build with InnoDB Memcached plugin
     args << "-DWITH_INNODB_MEMCACHED=ON" if build.with? "memcached"
 
-    # To enable unit testing at build, we need to download the unit testing suite
-    if build.with? "test"
-      args << "-DENABLE_DOWNLOADS=ON"
-    else
-      args << "-DWITH_UNIT_TESTS=OFF"
-    end
-
     system "cmake", ".", *std_cmake_args, *args
     system "make"
     system "make", "install"