Merge pull request #1740 from AFLplusplus/dev

push to stable

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+# custum mutator: symqemu
+
+This uses the symcc to find new paths into the target.
+
+## How to build and use
+
+To use this custom mutator follow the steps in the symqemu repository 
+[https://github.com/eurecom-s3/symqemu/](https://github.com/eurecom-s3/symqemu/) 
+on how to build symqemu-x86_x64 and put it in your `PATH`.
+
+Just type `make` to build this custom mutator.
+
+```AFL_CUSTOM_MUTATOR_LIBRARY=custom_mutators/symqemu/symqemu-mutator.so AFL_DISABLE_TRIM=1 afl-fuzz ...```
+
+## Options
+
+`SYMQEMU_ALL=1` - use concolic solving on **all** queue items, not only interesting/favorite ones.
+
+`SYMQEMU_LATE=1` - use concolic solving only after there have been no finds for 5 minutes.