Fix a bug in example code

Author: jart

examples/crashreport2.cc

@@ -7,9 +7,8 @@
 │   • http://creativecommons.org/publicdomain/zero/1.0/            │
 ╚─────────────────────────────────────────────────────────────────*/
 #endif
-#include "libc/calls/calls.h"
-#include "libc/math.h"
-#include "libc/runtime/runtime.h"
+#include <cosmo.h>
+#include <math.h>
 
 void crash(long x0, long x1, long x2,  //
            double v0, double v1, double v2) {

libc/log/showcrashreports.c

@@ -33,6 +33,7 @@ __static_yoink("__die");                       // for backtracing
 __static_yoink("ShowBacktrace");               // for backtracing
 __static_yoink("GetSymbolTable");              // for backtracing
 __static_yoink("PrintBacktraceUsingSymbols");  // for backtracing
+__static_yoink("__demangle");                  // for pretty c++ symbols
 __static_yoink("malloc_inspect_all");          // for asan memory origin
 __static_yoink("GetSymbolByAddr");             // for asan memory origin
 #endif