patch 8.2.4639: not sufficient parenthesis in preprocessor macros

Problem:    Not sufficient parenthesis in preprocessor macros.
Solution:   Add more parenthesis. (closes #10031)
diff --git a/src/option.h b/src/option.h
index 2116fe9..1529561 100644
--- a/src/option.h
+++ b/src/option.h
@@ -131,7 +131,7 @@
 #endif
 
 // end-of-line style
-#define EOL_UNKNOWN	-1	// not defined yet
+#define EOL_UNKNOWN	(-1)	// not defined yet
 #define EOL_UNIX	0	// NL
 #define EOL_DOS		1	// CR NL
 #define EOL_MAC		2	// CR
@@ -1328,6 +1328,6 @@
 };
 
 // Value for b_p_ul indicating the global value must be used.
-#define NO_LOCAL_UNDOLEVEL -123456
+#define NO_LOCAL_UNDOLEVEL (-123456)
 
 #endif // _OPTION_H_