feat: search sub framework paths in metadata generator (NativeScript#277)

Author: NathanWalker

metadata-generator/build-step-metadata-generator.py

@@ -90,6 +90,12 @@ def map_and_list(func, iterable):
 header_search_paths = env_or_empty("HEADER_SEARCH_PATHS")
 header_search_paths_parsed = map_and_list((lambda s: "-I" + s), shlex.split(header_search_paths))
 framework_search_paths = env_or_empty("FRAMEWORK_SEARCH_PATHS")
+# Add extra framework search path for newer Xcode versions
+extra_framework_path = os.path.join(sdk_root, "System/Library/SubFrameworks")
+if framework_search_paths:
+    framework_search_paths += " " + extra_framework_path
+else:
+    framework_search_paths = extra_framework_path
 framework_search_paths_parsed = map_and_list((lambda s: "-F" + s), shlex.split(framework_search_paths))
 other_cflags = env_or_empty("OTHER_CFLAGS")
 other_cflags_parsed = shlex.split(other_cflags)