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Flush stdout after PRINTLN

This allows debug PRINTLN statements to run even if
subsequent rgbasm directives cause a crash.

--- a/src/asm/parser.y

+++ b/src/asm/parser.y

@@ -1164,8 +1164,14 @@

 print		: T_POP_PRINT print_exprs trailing_comma

 ;

-println		: T_POP_PRINTLN { putchar('\n'); }

-		| T_POP_PRINTLN print_exprs trailing_comma { putchar('\n'); }

+println		: T_POP_PRINTLN {

+			putchar('\n');

+			fflush(stdout);

+		}

+		| T_POP_PRINTLN print_exprs trailing_comma {

+			putchar('\n');

+			fflush(stdout);

+		}

 ;

 print_exprs	: print_expr