Make skip-cmake-bootstrap unconditional

Follow up to #7089

I don't necessarily expect this to work as-is.

Author: neonichu

Utilities/bootstrap

@@ -238,8 +238,7 @@ def parse_build_args(args):
     args.bootstrap_dir = os.path.join(args.target_dir, "bootstrap")
     args.conf = 'release' if args.release else 'debug'
     args.bin_dir = os.path.join(args.target_dir, args.conf)
-    args.bootstrap = not args.skip_cmake_bootstrap or \
-                     not os.path.exists(os.path.join(os.path.split(args.swiftc_path)[0], "swift-build"))
+    args.bootstrap = not args.skip_cmake_bootstrap
 
 def parse_test_args(args):
     """Parses and cleans arguments necessary for the test action."""