Drop Python2.7 from the CMake definition (#62305)

Author: shahmishal

utils/swift_build_support/swift_build_support/products/cmake_product.py

@@ -194,8 +194,6 @@ def host_cmake_options(self, host_target):
                 host_target.startswith('appletv') or \
                 host_target.startswith('watch'):
 
-            swift_cmake_options.define('Python2_EXECUTABLE',
-                                       self.toolchain.find_tool('python2.7'))
             swift_cmake_options.define('Python3_EXECUTABLE',
                                        self.toolchain.find_tool('python3'))