minor error in compile.c

From: Mark Sheppard (msheppard_at_[hidden])
Date: 2003-10-13 11:23:51

The backtrace was missing a frame....

--- boost-jam-3.1.4.orig/compile.c 2003-10-13 17:22:45.000000000 +0100
+++ boost-jam-3.1.4/compile.c 2003-10-13 17:20:21.000000000 +0100
@@ -577,7 +577,7 @@
printf( " )\n* %s %s\n", message, arg ? arg->string : "" );
print_source_line( rule->procedure );
printf( "see definition of rule '%s' being called\n", rule->name );
- backtrace( frame->prev );
+ backtrace( frame );
exit(1);
}