patch 7.4.918
Problem: A digit in an option name has problems.
Solution: Rename 'python3dll' to 'pythonthreedll'.
diff --git a/src/option.h b/src/option.h
index 739fd67..f872836 100644
--- a/src/option.h
+++ b/src/option.h
@@ -689,7 +689,7 @@
EXTERN char_u *p_perldll; /* 'perldll' */
#endif
#if defined(DYNAMIC_PYTHON3) && !defined(WIN3264)
-EXTERN char_u *p_py3dll; /* 'python3dll' */
+EXTERN char_u *p_py3dll; /* 'pythonthreedll' */
#endif
#if defined(DYNAMIC_PYTHON) && !defined(WIN3264)
EXTERN char_u *p_pydll; /* 'pythondll' */