Fixed parentheses handling when a function-like macro name itself is used as an macro argument.

src/cc65/preproc.c

@@ -1142,7 +1142,16 @@ static void MacroReplacement (StrBuf* Source, StrBuf* Target, int MultiLine)
                         if (Whitespace > 0) {
                             SB_AppendChar (Target, ' ');
                         }
+
+                        /* Directives can only be found in an argument list
+                        ** that spans multiple lines.
+                        */
+                        if (MultiLine) {
                             if (CurC == '#') {
+                                /* If we were going to support #pragma in
+                                ** macro argument list, it would be output
+                                ** to OLine.
+                                */
                                 if (OLine == 0) {
                                     OLine = Target;
                                     ParseDirectives (0);
@@ -1153,6 +1162,7 @@ static void MacroReplacement (StrBuf* Source, StrBuf* Target, int MultiLine)
                             }
                             /* Add the source info to preprocessor output if needed */
                             AddPreLine (Target);
+                        }
                     } else {
                         /* Function-like macro */
                         if (OLine == 0) {