[fuzz] Don't use afl++ deferred forkserver mode

Deferring the forkserver initialization doesn't make sense for some of
our targets since they involve state that can't be forked (e.g.
threads). We therefore remove the use of __AFL_INIT entirely.

We also increase the __AFL_LOOP count to 100000. Our fuzz targets are
meant to all be deterministic and stateless therefore this should be
fine.

Author: dergoegge

src/test/fuzz/fuzz.cpp

@@ -192,17 +192,11 @@ int main(int argc, char** argv)
 {
     initialize();
     static const auto& test_one_input = *Assert(g_test_one_input);
-#ifdef __AFL_HAVE_MANUAL_CONTROL
-    // Enable AFL deferred forkserver mode. Requires compilation using
-    // afl-clang-fast++. See fuzzing.md for details.
-    __AFL_INIT();
-#endif
-
 #ifdef __AFL_LOOP
     // Enable AFL persistent mode. Requires compilation using afl-clang-fast++.
     // See fuzzing.md for details.
     const uint8_t* buffer = __AFL_FUZZ_TESTCASE_BUF;
-    while (__AFL_LOOP(1000)) {
+    while (__AFL_LOOP(100000)) {
         size_t buffer_len = __AFL_FUZZ_TESTCASE_LEN;
         test_one_input({buffer, buffer_len});
     }