testsuite: skipIfNoSBHeaders should skip when running remotely

The LLDB dylib/framework will not be available on the remote host, it makes
no sense to try to run those tests in a remote scenario.

(cherry picked from commit 270fe47)

Author: fredriss

lldb/packages/Python/lldbsuite/test/decorators.py

@@ -517,6 +517,9 @@ def is_remote():
 def skipIfNoSBHeaders(func):
     """Decorate the item to mark tests that should be skipped when LLDB is built with no SB API headers."""
     def are_sb_headers_missing():
+        if lldb.remote_platform:
+            return "skip because SBHeaders tests make no sense remotely"
+
         if lldbplatformutil.getHostPlatform() == 'darwin':
             header = os.path.join(
                 os.environ["LLDB_LIB_DIR"],